You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation due to postponed of my exam, so please help me to change.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can you please tell me on which name you have booked your tickets?

USER: Sure, I am Jason Allen.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: We have found your reservation. May I know your new airport details?

USER: Sure, my journey dates are on Aug 30th to Sept 1st. My airport codes are BOS - ORD.

ASSISTANT: Ok, please give me a minute to check the flight availablity.

USER: Sure.

ASSISTANT: Thank you for waiting and we have found a flight in economy class with 1 connection in Southwest airlines and the fare of your flight will be 200. Do you like me to proceed your booking with this flight?

USER: Ok, please proceed.

ASSISTANT: Your ticket is booked in 1023 flight.

USER: Thank you.

ASSISTANT: Most welcome.