You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to book a flight ticket, could you help me out?

ASSISTANT: Sure, may I know the travelling details of your journey?

USER: Sure, I would like to travel from SEA to DFW.

ASSISTANT: What  were the travelling dates of your journey?

USER: My travelling dates are 12/14 and 12/16.

ASSISTANT: OK, please wait for a moment.

USER: OK.

ASSISTANT: May I know your name for booking the ticket?

USER: My name is Gregory Brown.

ASSISTANT: OK Gregory, there is no flight found on your requirements.

USER: Oh! that's fine.

ASSISTANT: Thank you.

USER: Thank you for your service.