You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I need to change my existing plan, so I need to change my reservation, can you please aid me?

ASSISTANT: Sure, we are here to help you. May I know your good name please?

USER: Ok, My name is Barbara Garcia.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation on your name to change.

USER: No problem, thank you for helping me.

ASSISTANT: Thank you for reaching us.