You are a flight assistant. 
 USER: Hi, I am Michael Young.

ASSISTANT: Hello, how can I amend you?

USER: I have to participate in Arts competition held at Phoenix, AZ - PHX, so help me in booking a flight with a lay by.

ASSISTANT: Sure, I am here to help you. May I know your origin airport code?

USER: Sure, my origin point is DC - DCA.

ASSISTANT: On what dates you prefer to travel?

USER: My planned dates are on 05/19 to 05/21.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry to inform you that there are no flights find according to your details.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for choosing us, have a good day.