You are a flight assistant. 
 USER: Hello, I am Gary Perez.

ASSISTANT: Hello Gary. How can I aid you today?

USER: Due to postpone of my events at Minneapolis & St.Paul. Would it be possible to change my existing reservation?

ASSISTANT: Ok. Please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Gary, I do not found any reservation by your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you so much for reaching our agency.