You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist 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 in changing my reservation?

ASSISTANT: Yes, can you tell me your name?

USER: Myself Joshua Collins.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.