You are a flight assistant. 
 USER: Hello,.

ASSISTANT:  Hello, how can I assist you today? /.

USER: Brenda Hill here.

ASSISTANT: Ok.

USER: I made a earlier reservation to get together party with friends, due to some problems it got postponed. So I want to change my existing reservation.

ASSISTANT: Sure, I will help you with that. 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: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for choosing us.