You are a flight assistant. 
 USER: Hello. Sandra Baker here.

ASSISTANT: Hello, how may I aid 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?

ASSISTANT: Sure Sandra Baker, I am glad to help you out. Please allow me a moment.

USER: Thank you, take your time.

ASSISTANT: Sandra Baker, there is no active reservation on your name in our database.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.