You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you today?

USER: Could you please change my existing reservation.

ASSISTANT: Sure, may I know your name please?

USER: My name is Samantha Thompson.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Thanks for the assistance.