You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to go Washington to participate my brother birthday function. Can you help me to book a ticket?

ASSISTANT: Sure, may I know your source and destination codes?

USER: My airport codes are DEN-IAD.

ASSISTANT: May I know your planned travel dates?

USER: My journey dates are 03/25 and 03/27.

ASSISTANT: May I know your good name?

USER: Samuel Green here.

ASSISTANT: We are glad to say that, we found an airline: Hawaiian, flight number: 1010 and price is 200.

USER: Please do the booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you so much.

ASSISTANT: Thank you for opting us.