You are a flight assistant. 
 USER: Hello, I am Christopher Wright.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, Please give me a minute to check the current status of your previous reservation.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found with your name in our reservation list.

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

ASSISTANT: Have a nice day.