You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: I want to cancel my recent reservation, due to some health issue. Can you help me?

ASSISTANT: Sure, I am happy to help you. Could you please tell me your name?

USER: Thank you. I am Jack Harris.

ASSISTANT: Ok, please wait a minute.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you, there is no active reservation found with your name to cancel.

USER: Ok, not a problem. Thank you for your help.

ASSISTANT: You are welcome. Thank you for choosing us.