You are a flight assistant. 
 USER: Hi, kathleen Roberts here.

ASSISTANT: Hello Kathleen, how can I assist you today?

USER: My friend's party got postponed to next week. Can you help me to change my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: Just give me a moment, I will revert you back.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no reservation found with your name in our database.

USER: Not an issue. Thank you.

ASSISTANT: My pleasure.