You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please provide me your name.

USER: Joseph Nelson here.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for approaching us.