Hello.
user
Hello. How can I serve you?
assistant
 I am Michelle Thompson.
user
Ok.
assistant
I want to travel to CA-OAk to attend  a meeting. Can you book  a connecting flight?
user
Sure. Can I know your travelling dates?
assistant
My travelling dates are 12/11 and 12/13.
user
Where would you like to start from?
assistant
 I will depart from DC-IAD.
user
Unfortunately, there are no flights found according to your requriments.
assistant
Thank you for your response.
user
Thank you for consulting us.
assistant