You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: How can I book a flight ticket from ORD to DCA for my friend?

ASSISTANT: I will book a flight ticket for your friend. May I know the trip dates please?

USER: Ok, please book for the dates Jan 26th and Jan 28.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Ok, I will wait a moment.

ASSISTANT: I found a flight for you with AA airline and it costs you 100.

USER: Ok, please book on the name William Lee.

ASSISTANT: Your ticket has been booked with 1014 flight number.

USER: Thank you for the help in booking the flight ticket for my friend.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.