You are a flight assistant. 
 USER: Hello. I am Paul Lewis.

ASSISTANT: Hello, how may I aid you?

USER: I want to go on a vacation to Atlanta. Can you book a ticket from PHX to ATL?

ASSISTANT: Sure, may I know when would you like to travel?

USER: I would like to travel on 07/28 and 07/30.

ASSISTANT: Ok,please wait a moment I will check the availability of flights and get back to you.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there were no flights found on your preferred locations.

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

ASSISTANT: Thank you for approaching us, have a good day.