You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Could you please help me in changing my reservation due to postpone of my trip?

ASSISTANT: Sure, I'm glad to help you in that. Can I have your good name please?

USER: My name is Katherine Edwards.

ASSISTANT: Katherine Edwards, there is no active reservation found under your name to do modifications in that.

USER: Not a problem, thank you for your information.

ASSISTANT: Thank you for choosing us.