You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to change my reservation because my trip has been postponed. Can you assist me?

ASSISTANT: Sure, please share me your good name.

USER: Jennifer Mitchell.

ASSISTANT: Please wait for a while.

USER: Ok.

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

USER: No problem, thank you for searching.

ASSISTANT: Thank you for opting us.