You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: I will start on Jan, 20 and return on Jan, 22.

ASSISTANT: Do you prefer break in between your journey?

USER: Yes, I need a break.

ASSISTANT: Please let me know if you have any other specifications.

USER: My return time should be at morning.

ASSISTANT: May I know your good name please?

USER: Jonathan Clark.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.