You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me in reserving the ticket from BOS to DEN?

ASSISTANT: Sure, can I know the travel dates please?

USER: I am planning my trip on Jan 13 and again I will return back on Jan 15.

ASSISTANT: May I know your name please?

USER: Myself John Smith.

ASSISTANT: Can I know the connection limit please?

USER: I am comfort to travel in single connection flight.

ASSISTANT: Do you have any requirements?

USER: My depart time is evening.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Not a big problem, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for approaching us.