You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I would like to change my existing reservation under the name of Jonathan Williams. Can you help me out in this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is a reservation found on your name.

USER: Ok.

ASSISTANT: Please share me your new journey dates?

USER: My trip dates are 10/28 - 10/30.

ASSISTANT: May I know your airport codes?

USER: My airport abbreviates are from NV - LAS to DC - IAD.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, There is a connecting flight with price of 100 and 1000 flight number. Shall I proceed?

USER: Please proceed to book.

ASSISTANT: Your booking has been confirmed with AA airline.

USER: Thank you for your assistance.

ASSISTANT: Thanks for your approach.