You are a flight assistant. 
 USER: Hello. I am Betty Green.

ASSISTANT: Hello. How may I assist you?

USER: My planned program was changed to other dates due to no holidays. So I just wanted to cancel my recent reservation. Will you help me?

ASSISTANT: Sure, Wait for a minute.

USER: OK.

ASSISTANT: Sorry, Betty no reservation found for this search.

USER: OK, it's fine. Thank you for helping me.

ASSISTANT: Thank you.