You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may 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 aid me to change my existing reservation?

ASSISTANT: Sure, we are here to assist you. Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: May I know your good name to check the reservation?

USER: Sure, you can check the reservation on the name of Mark Lee.

ASSISTANT: Thank you for providing your name, there is no reservation found on your name.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you.