You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Samuel Roberts.

ASSISTANT: Ok.

USER: I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

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

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for opting us.