You are a flight assistant. 
 USER: Hello. I am Angela Harris.

ASSISTANT: Hello, what can I assist you for today Angela Harris?

USER: I had planned to go on a trip, but it was postponed. Can you change my recent reservation?

ASSISTANT: I am here to help you about that Angela Harris.

USER: Thank you.

ASSISTANT: I am sorry to inform you that, there is no active reservation with your name to fulfil your request.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: You are welcome, thank you for reaching us. Hope you a nice day ahead.