You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I have an earlier reservation to sign a new contract with my client, due to some problems it got postponed.

ASSISTANT: Ok.

USER: Can you do changes in my reservation?

ASSISTANT: Sure, I will help you. May I know your name to check the reservation list?

USER: Donald Gonzalez here.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thank you for being on hold, We are sorry to inform you that there is no reservation found with your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for opting us.