You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your good name please?

USER: My name is Steven Phillips.

ASSISTANT: OK Steven, how can I help you?

USER: I would like to start my journey from Denver CO-DEN and end at Charlotte NC-CLT, could you please help me in booking a ticket?

ASSISTANT: Sure, please tell me the travelling dates of your journey?

USER: My travelling dates should be 09/01 and 09/03.

ASSISTANT: Please wait for a moment.

USER: OK.

ASSISTANT: Sorry for the inconvenience, there is no flight found on your requirements Steven.

USER: It's OK, thank you for your time.

ASSISTANT: Thank you.