You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Helen Perez. Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, please wait while I take out your current reservation.

USER: Sure.

ASSISTANT: We don't have any reservation on your name to change.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.