You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Robert Jackson. I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Ok, please allow me to check with your existing reservation for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, there is no active reservation found under your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us, have a great day.

USER: You are welcome.