You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: My friend birthday party place has been changed to Atlanta, ATL. Can you please change my existing reservation?

ASSISTANT: Sure, I'll try to help you in changing an existing reservation. I need some basic information to check your ticket details, can you please tell me your full name?

USER: My name is Timothy Mitchell.

ASSISTANT: Ok, please wait a minute I will get back to you with the present status.

USER: Sure.

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

USER: Ok, that's not a problem. Thank you.

ASSISTANT: Thank you for approaching us.