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

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait a minute.

USER: Sure.

ASSISTANT: We could not found any reservation on your name in our database.

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

ASSISTANT: Thank you for opting us.