You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you today?

USER: I am Laura Jackson. I want to change my existing reservation as my interview got postponed. Please help m eout.

ASSISTANT: Sure, I'll try to change your existing reservation. Please wait a moment I will check the reservation status.

USER: Ok, take your time.

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 issues, thank you.

ASSISTANT: Thank you for choosing us.