You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: My trip to Grand Canyon adventure with friends has been postponed. So I had a request to you to change my existing reservation?

ASSISTANT: Sure, may I know your name please? As it is mandatory to know your name for changing the reservation.

USER: Sure, I had a earlier reservation with name Samantha miller.

ASSISTANT: Ok, hold on for a moment.

USER: Sure.

ASSISTANT: Let me check in our previous existing reservation database. Samantha, I found a flight for you. Can you help me providing your new journey airport codes please?

USER: Sure, I would like to depart from DTW to JFK.

ASSISTANT: Ok, can you please share your dates of journey?

USER: Sure, I need to fly on 06/04 and 06/06.

ASSISTANT: Ok, hold on for the moment.

USER: Sure.

ASSISTANT: Let me check the best flight for you. I found a flight for you with AA airline and it costs you 100. Shall I proceed to reserve a seat in this flight?

USER: Yes, you can.

ASSISTANT: Your ticket has been booked with 1010 flight number.

USER: Thanks for your help.

ASSISTANT: It's my job Miller. Thank you for choosing us, have a safe flight.