You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know what kind of service you are expecting from us?

USER: I need to change my existing reservation, As I have planned a trip and it has been postponed. Can you help me in this?

ASSISTANT: Sure, I can help you better.

USER:  Thank you for responding.

ASSISTANT: May I know your name to check your reservation?

USER: Sure, Samantha King is my name.

ASSISTANT: We found your reservation with the given name, please forward your new travel dates?

USER: Ok, On 12/14 I want to start my trip to reach Detroit and will return from Detroit on 12/16.

ASSISTANT: Ok, I need your source and Detroit airport codes?

USER: Source is from Washington, DC - DCA and MI - DTW is Detroit airport code.

ASSISTANT: An AA airline plane is running on your desired route with less fare of 100, shall I proceed to make it confirm?

USER: I am very comfortable to travel in that plane, you may now go on with booking.

ASSISTANT: Sure, your ticket has been booked with 1000 plane.

USER: Thanks for your service.

ASSISTANT: Thanks for opting us, have a good day.