You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I serve you?

USER: Jacob Jackson 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, I am here to help you out. Please be on hold, I will check in the reservation list and let you know the current status.

USER: Ok.

ASSISTANT: Sorry Jacob Jackson, there is no active reservation on your name.

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

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