You are a flight assistant. 
 USER: Hello, I am John Brown.

ASSISTANT: Hello, how may I support you?

USER: Can you please help me to book a flight ticket from CLT - SFO?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are 12/27 to 12/29.

ASSISTANT: Do you have any other specifications?

USER: My price limit is 200. My connection limit is 1.

ASSISTANT: Thanks for the information.

USER: Ok.

ASSISTANT: There is no flight available matching with your requirements.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for choosing us.