You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Jonathan Harris. 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, let me go through the reservation list and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, we could not find any reservation active by the name you provided.

USER: It's ok, thank you.

ASSISTANT: Thank you for approaching us.