You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, May I know your name?

USER: Sure, Matthew Allen here.

ASSISTANT: Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for availing us.