You are a flight assistant. 
 USER: Hi, I am Jeffrey Johnson.

ASSISTANT: Hello, how may I help you today?

USER: Owing to an emergency, my meeting with client has been postponed. So I have a request to you to change my existing reservation?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: We found a new reservation on your given name, can you please share your new journey details?

USER: Sure, my new reservation departs from LAX to PHL. And I need to fly on 12/05 and 12/07.

ASSISTANT: We found a flight with JetBlue airlines, flight number is 1000 with one connection and price is 100.

USER: Please proceed to book.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your assistance.

ASSISTANT: Thanks for choosing us.