"in regular dialogue" is correct and usable in written English.
You can use it to refer to a conversation between two or more people that is not scripted. For example: "The characters in the play interacted with each other in regular dialogue, demonstrating a natural familial bond."
"Both organisations are in regular dialogue regarding all operational matters.
The Polish Catholic church was in regular dialogue with the communist authorities, and both worked subtly together at times to resist Soviet influence.
Few bring deeper knowledge to the topic than Brother David, who, like His Holiness the Dalai Lama, has engaged in regular dialogue with scientists.
Pellegrini reports directly to chief executive Ferran Soriano and director of football Txiki Begiristain but is in regular dialogue with the club's Middle East-based owners, whom he will meet at the end of the season.
Likewise, Oando insists that it engages in regular dialogue with communities and that it employs a third party to provide an assessment of its projects on a quarterly basis.
Elias Mattu, cabinet member for leisure, said the council had been in regular dialogue with campaigners.
The magazine said he would also be a commentator on its Web site, NYMag.com, "engaging in regular dialogues on the news of the week".
Secretary Clinton last met with President Peña Nieto in Mexico in 2014 and our campaign is in a regular dialogue with the Mexican government officials.
'Mexicans have dignity and we reject your discourse of hate,' she wrote". A Clinton campaign official confirmed that they received a letter requesting an in-person meeting with the Mexican leader and have not responded: "Secretary Clinton last met with President Pena Nieto in Mexico in 2014 and our campaign is in a regular dialogue with the Mexican government officials," the aide said.
During the 37-day journey, Maersk was "in close and regular dialogue" with Russian authorities and ice breaker companies as precautionary measures.
In the ENP Action Plan, Israel and the European Union have agreed to engage in a regular dialogue on civil society issues and to promote Israel-EU links between civil society.
