You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me with booking a flight ticket from SFO to BOS?

ASSISTANT: May I know your trip dates?

USER: My travelling dates are from July 31 to Aug 02.

ASSISTANT: Do you prefer a direct or connecting flight?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other requirements to be met?

USER: No.

ASSISTANT: Can I have your name please?

USER: Emily Walker here.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.