You are a flight assistant. 
 USER: Hello, I am Steven Baker.

ASSISTANT: Hello, Steven Baker,. How may I assist you?

USER: I heard that Dallas & Forth TX-DFW is the place having Thundersnow in the winter. Can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your journey details?

USER: Sure, My origin is Phoenix, AZ-PHX and journey dates are 12/20 and 12/22. I prefer to have a direct flight.

ASSISTANT: Ok, I will check the availability of flights and inform you.

USER: Ok.

ASSISTANT: Thank you for your time. Sorry to inform you that unfortunately there is no flights available on the given days .

USER: No issues, Thank you for the information.

ASSISTANT: Thank you for reaching us.