You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how shall I help you?

USER: I am Jack Lee, I need to change my previous reservation that I made earlier to attend a flower festival. Will you please assist me in doing that?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thank you for your time. Sorry, we did not find any reservation in your given name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for reaching us.