You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to buy a plane ticket. Please help me in that.

ASSISTANT: Sure, tell me your name please?

USER: My name is Susan Thompson.

ASSISTANT: May I know your connection limit please?

USER: No, I am comfortable with any flight.

ASSISTANT: Now please share your airport codes?

USER: My source airport code is PHL and my destination airport code is IAH.

ASSISTANT: Your travel dates please?

USER: My trip dates are from Dec, 28 to Dec, 30.

ASSISTANT: Do you have any other preferences?

USER: I prefer normal-cost airlines.

ASSISTANT: Wait for a moment please.

USER: Ok.

ASSISTANT: Thanks for waiting. I have found a normal-cost airlines that is Delta airlines and it is a direct flight.

USER: Please proceed.

ASSISTANT: Yes, I have confirmed your flight ticket successfully.

USER: Please provide me flight number and fare.

ASSISTANT: The flight number is 1006. Thank you.

USER: Thank you for booking.

ASSISTANT: The fare is 200. Thank you.