You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Due to an emergency, I want to change my reservation. Can you help me?

ASSISTANT: Sure, may I know your name please?

USER: Benjamin Nelson here.

ASSISTANT: Please wait for a moment.

USER: Ok.

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

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for opting us.