You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Lewis.

ASSISTANT: How can I do help you?

USER: I want to attend a meeting in Phoenix. Can you book a ticket from DEN to PHX?

ASSISTANT: Sure, I am happy to help you, may I know the dates of your trip?

USER: I want to travel on 01/13 and 01/15.

ASSISTANT: Thank you for your information. I am unable to find a flight on the trip dates that you have given. Sorry for the trouble.

USER: That's ok.

ASSISTANT: Most welcome.

USER: Anyways, thank you for your help.