You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Can you help me to cancel the reservation which I had done recently?

ASSISTANT: Sure, I am here to help you. Can I know your name please?

USER: My name is Mary Clark.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: Ok, thank you for choosing our agency.

ASSISTANT: Thanks for contacting us.