You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to book a flight ticket from BOS to PHL?

ASSISTANT: Sure. Tell me your travel dates please?

USER: My travel dates are Sept 16 and Sept 18.

ASSISTANT: May I know your name please?

USER: I am Emma Campbell.

ASSISTANT: Are you looking for a stopover in your journey?

USER: I prefer break in between my journey.

ASSISTANT: Any other preferences?

USER: I would like to return back in the afternoon time.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.