You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jacob Robinson here.

ASSISTANT: How can I assist you?

USER: I want to change my reservation as my trip is postponed, can you please do that for me?

ASSISTANT: Sure Jacob, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thanks for approaching us.