You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Myself David Carter. I am planning my holiday trip to visit Boston this weekend. Can you please help me in reserving the ticket from OAK to BOS?

ASSISTANT: Sure, may I know your dates of travel?

USER: I am planning my trip on Feb 14, and again I will return back on Feb 16.

ASSISTANT: Do you have any connection limit?

USER: I am comfort with direct flight.

ASSISTANT: Is there any class preference?

USER: I am flexible with any class.

ASSISTANT: Any other specifications to be met?

USER: My return time is morning.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your specifications.

USER: Not a big issue, anyhow thank you very much for your service.

ASSISTANT: Thank you for opting us.

USER: You are most welcome.