You are a flight assistant. 
 USER: Hello, I am Samantha Lee.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Ok, please hold a minute.

USER: Sure.

ASSISTANT: Thanks for your time, sorry, no reservation found with your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.