You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Stephen Robinson here.  I would like to book a ticket from BOS to SFO.

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates are Nov 03 and Nov 05.

ASSISTANT: Do you have any connection limit?

USER: No, I have none.

ASSISTANT: May I know your airline preference?

USER: No, but I want my return time in the morning.

ASSISTANT: Ok, do you have any other requirements?

USER: No. Thank you for asking.

ASSISTANT: Sorry, there are no flight as per your travelling details.

USER: No problem, thank you for asking.

ASSISTANT: Thank you for choosing us.