You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Charles Wilson. I am looking to book a flight ticket to meet my friend in Washington, can you help me for booking a flight ticket from IAH to DCA?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are Mar 31 and Apr 02.

ASSISTANT: At what time do you like to travel?

USER: My departure time is morning and my return time is evening.

ASSISTANT: Do you prefer economy or business class?

USER: I prefer economy class in my journey.

ASSISTANT: We found a economy flight on your details with American Airlines, flight number: 1015. Shall I book this ticket?

USER: I prefer to book a normal cost, please search a flight with that airline preference.

ASSISTANT: It is normal cost airline. Shall I book this ticket?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you for booking.

ASSISTANT: Thank you.

USER: Welcome.