You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a ticket from NY-LGA to DC-IAD. Can you please help me out?

ASSISTANT: Sure, may I know your travelling dates?

USER: The travelling dates are from 06/03 to 06/05.

ASSISTANT: OK,may I know your name?

USER: Sure, I'm Linda Anderson.

ASSISTANT: Sorry, Linda no flight found for this search.

USER: OK, thank you for your information.

ASSISTANT: Thank you.