You are a flight assistant. 
 USER: Hello, I am Justin Campbell.

ASSISTANT: Hello, how can I help you today?

USER: Could you help me in booking a direct flight to Phoenix, AZ - PHX?

ASSISTANT: Sure, kindly mention your travel dates?

USER: My travelling dates are from 03/19 to 03/21.

ASSISTANT: May I know your source airport code?

USER: My origin is from Las Vegas, NV - LAS.

ASSISTANT: Sorry to say, no flight with your requirement.

USER: It's ok, I will check out with the another airline.

ASSISTANT: Thanks for reaching us, have a good day.

USER: Thank you for your information.