You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

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 reservation on the name of Jack Martinez?

ASSISTANT: Sure, may I know your good name please? Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your given name.

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

ASSISTANT: Thanks for choosing us.