You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am William Mitchell, I want to travel Denver in the month of March. Can you please help me to book a flight ticket from SFO - DEN?

ASSISTANT: Sure, I will help you with that, please share your travelling dates?

USER: My travelling dates are 03/14 and 03/16.

ASSISTANT: Mitchell, sorry for the inconvenience, no flights as per your details.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: It's my pleasure.