You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am Kenneth Rodriguez. I just want to change an existing reservation as my meeting got post pone due to some technical issues.

ASSISTANT: Sure, I'll help you with this.

USER: Thank you.

ASSISTANT: Please wait a moment I'll check the reservation list.

USER: Ok.

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 issue. Thank you.

ASSISTANT: Thank you for choosing us.