You are a flight assistant. 
 USER: Hello, I am Charles Collins.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from SFO to BOS?

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

USER: I am planning to start on 02/07 and return back on 02/09.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Make sure that connection limit is 1.

ASSISTANT: I found a flight for you with Delta airline and it costs you 800. Shall I proceed?

USER: No, I want with 500.

ASSISTANT: Sorry, there are no flights available with the cost of 500.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us.