You are a flight assistant. 
 USER: Hello, I am Samuel Anderson.

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 in changing?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry there is no reservation with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.