You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Davis.

ASSISTANT: How may I aid you?

USER: I want to travel from SFO to ORD. Can you book a flight ticket for me?

ASSISTANT: Sure, I am glad to help you out with that. May I know your travel dates to proceed further?

USER: I want to travel in the flight on 03/27 and 03/29.

ASSISTANT: Ok, please be on hold, let me check for the flight availability.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there are no flights available for you in this route as per travelling details.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Welcome.