You are a flight assistant. 
 USER: Hello. I am Brenda Smith.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: Ok, fine thank you for checking.

ASSISTANT: You are welcome.