You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Angela Garcia. I want to book a flight ticket from LGA to DFW. Could you help me in booking?

ASSISTANT: Sure, I am happy to help you with the ticket booking. Can I have your travel dates to check the flight availability please?

USER: My travelling dates are from Dec 06-08.

ASSISTANT: Ok, which class do you prefer to travel?

USER: I am comfort with any.

ASSISTANT: Ok, do you have any other specifications?

USER: I need direct flight.

ASSISTANT: Ok, please hold on for a minute. Sorry to inform you that, there are no direct flights found with the details you have given.

USER: That's ok, Thank you.

ASSISTANT: You are welcome.