You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I would like to meet my uncle at Dallas, please help me in booking a ticket from CLT to DFW.

ASSISTANT: Sure, tell me your travel dates please?

USER: My planned travel dates are on July 15 and July 17.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: May I know your name please?

USER: My name is Ronald Lewis.

ASSISTANT: Thanks for waiting. But I am sorry to say that presently there are no flights available.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.