You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Rebecca Clark here. I am looking for a direct flight in my journey from PHX to ATL. Can you please help me out in booking a flight ticket?

ASSISTANT: Ok, may I know the travel dates too?

USER: My travelling dates are from 12/21 to 12/23.

ASSISTANT: Sorry, there is no flight available at the location you desire.

USER: Not a problem, thank you for your kind information.

ASSISTANT: Thank you for choosing our agency.

USER: Thank you for your help in searching.