You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Brian Gonzalez. I am planning to travel from CLT to DCA, could you please help me with booking a flight ticket?

ASSISTANT: May I know your dates of journey please?

USER: My travelling dates are 09/27 and 09/29.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Brian, there is no flight found as per your request.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for your service.

USER: You are welcome.

ASSISTANT: Have a nice day.