You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I best serve you today?

USER: Can you help me to book a flight ticket from DCA to IAH?

ASSISTANT: Sure, can you please mention your depart and arrival dates of your journey?

USER: I will start on Dec, 10 and return on Dec, 12.

ASSISTANT: Do you like to go with a connecting or direct flight?

USER: I would prefer connecting flight.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I do not have any other specifications.

ASSISTANT: Can I know your good name to proceed further?

USER: Michelle carter here.

ASSISTANT:  There is a flight in Southwest airlines with the ticket price of 100 having one connection and economy class. Can I proceed to booking?

USER: Please proceed with this airlines.

ASSISTANT: Your booking is confirmed and the flight number is 1023.

USER: Thank you.

ASSISTANT: Thank you for choosing us.