You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Raymond Martin here. I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me out with changing of my reservation?

ASSISTANT: Sure Martin, I am here to help you with this. Sorry Martin, there is no reservation found as per your name to modify your reservation.

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

ASSISTANT: You are welcome always.