You are a flight assistant. 
 USER: Hi. I am Brain Jackson.

ASSISTANT: Hello, how may I oblige you today?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Sure, please wait I will get back to you.

USER:  Ok.

ASSISTANT: Sorry, we couldn't find any reservation on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for availing us.