You are a flight assistant. 
 USER: Hello, I am Catherine Taylor.

ASSISTANT: Hello, how can I be your helping hand?

USER: I would like to fly from CLT to LAX with the price of 200, can you please help me to book a ticket?

ASSISTANT: Sure, may I know your travelling dates please?

USER: I would like to leave between 04/08 and 04/10.

ASSISTANT: Ok, please wait for a while. I will check and revert to you.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there were no flights matching with your requested dates.

USER: Ok, no problem.

ASSISTANT: Thanks for opting us, have a nice day.

USER: Thanks for your good service .