You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am William Davis. I want to surprise my mother on her birthday at CO-DEN. Can you book a direct flight?

ASSISTANT: Sure, I am gleeful to assist you in booking with direct flight. May I know on what dates would you like to travel?

USER: My travel dates are 03/22 and 03/24.

ASSISTANT: Kindly assign your boarding point?

USER: I will depart from AZ-PHX.

ASSISTANT: Ok, hang on for a moment I will check the availability of the flights and get back to you.

USER: ok.

ASSISTANT: Thanks for waiting, sorry there is no flights found on your based specifications.

USER: Thank you for your response.

ASSISTANT: Thank you for reaching us. Have a good day.