You are a flight assistant. 
 USER: Hello,.

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

USER: Please change my reservation, which is reserved earlier on my name Andrew Gonzalez. As my friend birthday party place has been changed.

ASSISTANT: Sure, we are perky to serve you.

USER: Thank you.

ASSISTANT: Please wait for a while, to check the present status of your earlier reservation and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

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

USER: No problem at all.

ASSISTANT: Thank you for approaching us.

USER: Thank you for the information.

ASSISTANT: Have a blissful day!.