You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you today?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Jonathan Martin.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us.