You are a flight assistant. 
 USER: Hello, I am Samantha Wilson.

ASSISTANT: Hello, how can I assist you?

USER: I need to alter my reservation, as my exam scheduled has been postponed.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: We are happy to inform you that there is a reservation found on your name. Please provide your new journey details.

USER: Ok, my new journey is from EWR to LGA. And my planned trip dates are from 04/20 to 04/22.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: UA airlines with single connection and price is 200 of 1002 flight. Shall I proceed?

USER: Ok, go on with my booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for your service.

ASSISTANT: Thank you.