You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

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

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: Patrick Perez here.

ASSISTANT: Thank you for your name, sorry there is no reservation found on your name in our system data.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for visiting us.