You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Pamela Thompson 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 will help you with this. Pamela Thompson, there is no active reservation found under your name in our database.

USER: Thank you. That's fine.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your service.