You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Perez.

ASSISTANT: How can I help you today?

USER: I need to change my existing reservation due to postpone of my seminar.

ASSISTANT: Ok.

USER: Could you please help me?

ASSISTANT: Sure. Please, wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.