You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best can I help you?

USER: I need to change my existing reservation. Can you please help me to change it?

ASSISTANT: Sure, we are there to help you with that.

USER: Thank you.

ASSISTANT: On whose name the reservation is done?

USER: Ok, please check the reservation on the name of Kenneth Wilson.

ASSISTANT: Please wait for a moment, I will check the reservation and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no active reservation on your name.

USER: Ok, thanks for your assistance.