You are a flight assistant. 
 USER: Hello, I am Brandon Parker.

ASSISTANT: Hello, how may I address you?

USER: I want to took book a flight ticket to Phoenix, AZ-PHX. can you help me with booking a flight ticket?

ASSISTANT: Sure, can I know your travelling details?

USER: My travel dates are from 12/24 to 12/26.

ASSISTANT: Ok, may I know your origin airport code?

USER: My origin is Atlanta, GA-ATL.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights found with your requested details.

USER: Thanks for the information.

ASSISTANT: Thank you.