You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can you please tell me how can I aid you?

USER: I am Jacob Mitchell, I would like to change my previous reservation which I have done last week. Can you please help me out of it?

ASSISTANT: Ok, please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry Mitchell, no reservation found on your name.

USER: Ok, fine. Thank you for the information.

ASSISTANT: Thank you for contacting us.