You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I support you today?

USER: I need to change my existing reservation as my board meeting got postponed. Can you help me updating the reservation which was made on the name of Pamela Scott?

ASSISTANT: Sure, I would be happy to help you. Please wait, I will check the present status of your reservation.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry to say that, we did not find any reservation on your name to change it.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for your presence.