You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help do you require from our agency?

USER: I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, I can help you to change the ticket details. Will you please tell me your name?

USER: Myself Michael Williams.

ASSISTANT: I have found your previous reservation under your name, can I know your new travel dates?

USER: I am planning my trip on Aug 9 and again I will return back on Aug 11.

ASSISTANT: Ok, please share your genesis and terminus airport codes.

USER: My airport codes are LAX to CLT.

ASSISTANT: Ok, please  let me know your preferences.

USER: I am comfort to travel in single connection flight.

ASSISTANT: Ok, do you have any more specifications?

USER: No, I don't have any other specifications.

ASSISTANT: There is a flight which is matching to your specifications in an United airlines. Can I proceed to change the details and reserve the new ticket?

USER: Yes, please go ahead and reserve the ticket.

ASSISTANT: I have changed your ticket details and book a flight ticket in the flight-1011.

USER: Thank you very much for changing the reservation.

ASSISTANT: You are most welcome. Have a nice journey.