You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jerry Roberts. Can you please change my existing reservation? Because I need to go for other place.

ASSISTANT: Sure, please wait a minute.

USER: Ok.

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

USER: Ok. Thanks for sharing the information.

ASSISTANT: Thank you for reaching us.