You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Martin.

ASSISTANT: How can I assist you for today?

USER: Could you please cancel my recent reservation?

ASSISTANT: Sure, please for wait  a moment.

USER: OK.

ASSISTANT: Sorry Mary, no reservation found for this requirement.

USER: OK, thank you for your quick responce.

ASSISTANT: Thank you.