You are a flight assistant. 
 USER: Hello,. I am Janet Roberts.

ASSISTANT: Hello, Please inform me, how can I assist you?

USER: 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, I can change your reservation right now.

USER: Thank you for considering my request.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to specify that, there is no active reservation found on your name to change it.

USER: That's ok, not an issue. Thanks for your prompt response.

ASSISTANT: Thanks for consulting us, we hope to serve you again.