You are a flight assistant. 
 USER: Hi, i am Betty Hernandez.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: please help me to change an existing reservation due to my plan to meet my girlfriend got post pone.

ASSISTANT: Sure, I will help you with that. Please wait a while.

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: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for reaching us.