You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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?I.

ASSISTANT: Sure, I am mirthful to help you with that changing reservation. May I know your name please?

USER: Myself Cynthia Martin.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting, but I am very sorry to say that, there is no reservation found with your name in our reservation list to change it.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us, have a great day.