You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning for business vacation from TX-DFW to NY-LGA.Can you please help me for booking the flight ticket?

ASSISTANT: Help me with the dates please.

USER: The travelling dates are from 04/14 to 04/16.

ASSISTANT: May I know your name?

USER: Sure, my name is Elizabeth Green.

ASSISTANT: Sorry, there is no flight found.

USER: Ok, It's fine.

ASSISTANT: Thank you.

USER: Thank you for your information.