You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: My name is Robert Thomson.

ASSISTANT: Robert, how may I assist you?

USER: Owing to an emergency, I had to request for this change reservation.

ASSISTANT: Hold on for a moment.

USER: Ok.

ASSISTANT: Sorry, There are no flight ticket found with your name.

USER: That's ok, thank you for your help.

ASSISTANT: Welcome.