You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation which is done recently due to some problems, can you please help me out?

ASSISTANT: Sure, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: May I know your name?

USER: Sure, my name is Donna Parker.

ASSISTANT: Sorry Donna Parker, there is no active reservation on your name.

USER: Ok, not an issue. Thank you for your service.

ASSISTANT: Thank you.