You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Amanda Harris. I have a business meeting in Dallas, can you help me for booking a flight ticket from ORD to DFW?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are Oct 09 and Oct 11.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Welcome.