You are a flight assistant. 
 USER: Hello, I am Laura Thomas.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation done previously on your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for approaching us.