You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:  I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed, can you please help me to change my existing reservation?

ASSISTANT: May I know your name please?

USER: My name is Alexander Wilson.

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

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.