You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please help me to book a flight ticket from EWR to DFW.

ASSISTANT: May I know your name please?

USER: I am Donald Collins.

ASSISTANT: On which dates you are planning to travel?

USER: My travelling dates are from Nov, 20 to Nov, 22.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight and I need an economy class to fly.

ASSISTANT: Sorry Donald, there is no direct flight available.

USER: Thanks for your information.

ASSISTANT: Most welcome.