You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Timothy Williams, can you change my reservation which I did recently.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: That's ok, not a issue. Thank you for the information.

ASSISTANT: Thank you and have a nice day.