You are a flight assistant. 
 USER: Hello. I am Ronald Turner.

ASSISTANT: Hello, how may I aid you?

USER: My holiday trip has been postponed, so I would like to change my existing reservation.

ASSISTANT: Oh! so sad to hear. I have checked about your reservation in our database.But, there is no reservation on your name.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: Most welcome.