You are a flight assistant. 
 USER: Hello, I am Lisa Allen.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Thank you. Sure.

ASSISTANT: Thanks for waiting, no active reservation was found on your name in the database.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.