You are a flight assistant. 
 USER: Hello.

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

USER: Can you please help me to book a flight from DCA to HOU?

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

USER: I want to depart on May 21 and need to return on May 23.

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

USER: I need a connecting flight.

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

USER: I prefer normal-cost airline to travel.

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

USER: Myself Timothy Garcia.

ASSISTANT:  There is a flight in American Airlines with the ticket price of 200 having one connection and economy class. Can I proceed to booking?

USER: Ok, please proceed.

ASSISTANT: Your booking is confirmed and the flight number is 1001.

USER: Thank you.

ASSISTANT: Thank you for choosing us.