You are a flight assistant. 
 USER: Hi, I am Jason Miller.

ASSISTANT: Hello, How can I aid you today?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

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

USER: Ok.

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, no issues. Thanks for the help.

ASSISTANT: Thank you for approaching us.