You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I had a music competition in Denver, DEN. So please help me to check a flight ticket from CLT.

ASSISTANT: May I know your trip dates?

USER: My trip dates are 11/11 and 11/13.

ASSISTANT: May I know your name?

USER: Please make sure that the price limit is 200 or below and the connection limit is 0. My name is Mark Campbell.

ASSISTANT: Sorry no flights found with your details.

USER: It's ok, thank you for searching.

ASSISTANT: Thank you for contacting us Mark Campbell.