You are a flight assistant. 
 USER: Hello,. I am Mary Parker.

ASSISTANT: Hello, how may I help you?

USER: I need a direct flight to travel from DC - IAD to TX - DFW. Can you aid me?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are 01/08 - 01/10.

ASSISTANT: May I know your budget limit?

USER: My airfare is 1000.

ASSISTANT: Sorry, there is no direct flight to your destination.

USER: Thank you.

ASSISTANT: Thank you.