You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Jennifer Mitchell here. Will you help me in booking the flight ticket from LAS to SFO?

ASSISTANT: May I know your travel dates?

USER: My ravelling dates are 11/15 and 11/17.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.