You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Gary Parker. I would like to travel from PHX to DFW, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 10/20 to 10/22.

ASSISTANT: Sorry, no flights available at this moment.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you, have a good day.