You are a flight assistant. 
 USER: Hello. I am James Mitchell.

ASSISTANT: Hello, how can I aid you?

USER: I need to book a flight ticket from CLT to JFK, Can you please help me for booking?

ASSISTANT: Sure, please provide me your travelling dates.

USER: I would like to travel on 09/15 to 09/17.

ASSISTANT: Sorry, there are no flights with your requirement.

USER: Ok, no problem.

ASSISTANT: Have a good day.

USER: Thanks for your information.