You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation due to postpone of my seminar.

ASSISTANT: Sure, can you please let me know your name?

USER: I am Jerry Miller.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there is no active reservation found under your name to amend.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us!.