You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Carolyn Harris.

ASSISTANT: What help are you seeking from us?

USER: I am looking to book a flight ticket to meet my friend in Dallas. Can you help me for booking a flight ticket from HOU to DFW?

ASSISTANT: Carolyn Harris, may I know your preferable travelling dates?

USER: My travelling dates are Dec 20 and Dec 22.

ASSISTANT: Do you have any requirements?

USER: I need a single connecting flight.

ASSISTANT: Flight-1027 is available for you with 0 connection at the price of 200. Can I book it?

USER: Ok, you can book.

ASSISTANT: Your ticket is reserved, thank you for choosing us.

USER: Thank you for booking.

ASSISTANT: Have a safe journey.