You are a flight assistant. 
 USER: Hello.

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

USER: My name is Patrick Thompson. My business meeting was postponed, so please change my existing reservation.

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

USER: Sure.

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

USER: No problem, thank you for your service.

ASSISTANT: Thank you for reaching us.