You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to cancel my previous reservation because I am unable to travel due to some health issues. Can you please help me?

ASSISTANT: May I know your name?

USER: Thank you. I have booked the ticket with the name Jack Williams.

ASSISTANT: Wait a moment.

USER: Ok, take your own time.

ASSISTANT: Sorry, there is no reservation found on your name to cancel it.

USER: It's ok, not a problem with that. Thank you for checking the ticket status.

ASSISTANT: Thanks for consulting us.