You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, I will help you. Please provide the name on which ticket was reserved.

USER: Carol Wright here.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome, have a nice day.