You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a ticket from Phoenix, AZ - PHX to Charlotte NC - CLT. My boarding date is on Feb 20th and returning date is on Feb 22.

ASSISTANT: Thanks for providing your details. Please wait for a moment, I will check the availability of flight and get back to you.

USER: OK.

ASSISTANT: Thanks for your patience. Sorry, we did not find any flight based on your details.

USER: OK, no problem.

ASSISTANT: May I know your name please?

USER: My name is Catherine Robinson.

ASSISTANT: OK, Thanks for choosing us.

USER: Thank you for your information.

ASSISTANT: Have a nice day.