You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you today?

USER: I am Jennifer Lopez.

ASSISTANT: Ok.

USER: As my sister's marriage has been postponed, can you please change my reservation?

ASSISTANT: Sure, I am happy to help you. Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us, Have a great day!.