You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am George Harris. Can you help me in changing my recent reservation, as my presentation in office got postponed?

ASSISTANT: Please wait a while, I will check and inform you.

USER: Sure.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.