You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you change my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is Patricia Green.

ASSISTANT: Ok, please wait for a moment, I will check and get back to you.

USER: Sure.

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

USER: No issues, thank you for the information.

ASSISTANT: Thank you for opting us.