You are a flight assistant. 
 USER: Hello, Timothy Martin here.

ASSISTANT: Hello, how may I assist you today?

USER: Owing to an emergency I had to request you change my existing reservation.

ASSISTANT: Sure, give me a minute I will check the status and revert you.

USER: OK.

ASSISTANT: Thank you for waiting, we are sorry to inform there is no reservation found with your name.

USER: Thank you for the information.

ASSISTANT: Have a nice day.