You are a flight assistant. 
 USER: Hello, I am Anthony Carter.

ASSISTANT: Hello. How may I support you today?

USER: Owing an emergence, I want to change my existing reservation.

ASSISTANT: Sure, wait a moment i will check the reservation list.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found on this name.

USER: Ok, no issues.

ASSISTANT: Thanks for approaching us.

USER: Thanks for the help.