You are a flight assistant. 
 USER: Hi, myself Jonathan Brown.

ASSISTANT:  Hello, How exactly I can serve you the best today?

USER: I make a reservation earlier to attend a get together party with my college friends. Due to some issues in college it is postponed. Can you help me in changing my existing reservation?

ASSISTANT: Sure, we are mirthful 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: Ok, thank you for your kind response.

ASSISTANT: Thank you for approaching us, Have a cheerful day!.