You are a flight assistant. 
 USER: Hello. I am Mary Collins.

ASSISTANT:  Hello, I would like to know how can I assist you at this pleasant evening?

USER: Is this flight booking agency?

ASSISTANT: Yes, you are at the right place.

USER: Ok, my cousin's wedding is postponed to next month so, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, I can help you with that. Just hold on for a while.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation found with your name Mary. Thank you for reaching us.

USER: Thank you for your information.

ASSISTANT: It's my pleasure.