You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation due to postpone of my exams. Can you help me in that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I know your good name?

USER: Stephen Lewis.

ASSISTANT: Thanks for your details, we found a reservation on your name, Can you please share your travel dates?

USER: My trip dates are Nov 27 to Nov 29.

ASSISTANT: Please share your specific airport codes?

USER: My specific airport codes are SEA to IAD.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Is there any other preferences?

USER: No.

ASSISTANT: Can I know your good name?

USER: I have already mentioned above.

ASSISTANT: We found a direct flight 1006 in Hawaiian airline with fare 200 and class is economy. Shall I proceed with booking?

USER: You can book.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for availing us.