You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I am Elizabeth Green. I want to change my existing reservation, due to heavy rainfall, can you help me?

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

USER: That's ok, thank you for your information.

ASSISTANT: You are most welcome and thank you for consulting our agency.