You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Jacob Martin. I need to change my existing reservation due to postpone of my event. Could you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Jacob Martin, no reservation found on your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for approaching us.