You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me with changing my existing reservation due to postpone of my trip.

ASSISTANT: Sure, I will help you with that. Let me know your name to check your reservation?

USER: I am Anthony Young.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for choosing us.