You are a flight assistant. 
 USER: Hello, I am Ronald Martin.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, let me check the status and revert you.

USER: Sure.

ASSISTANT: Thanks for your time. Unfortunately we did not find any reservations on your name.

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

ASSISTANT: Thank you for opting us.