You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am George Garcia.

ASSISTANT: How may I guide 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 George Garcia, I am mirthful to help you with that reservation changing.

USER: Thank you.

ASSISTANT: Please hold for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Sorry to tell you that, there is no active reservation found with your name in our reservation list to change it.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.