You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you?

USER: I am Kevin Anderson, I want to change my existing reservation, due to my personal problems.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being patient. There are no reservation found by this name.

USER: Ok, not an issue. Thank you, for your service.

ASSISTANT: Thank you  for choosing us.