You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jack Williams here.

ASSISTANT: How may I help you?

USER: Can you please check with my previous booking status? I need to cancel my reservation due to my health issues.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. Sorry, we could not found any reservation on your name.

USER: That's fine. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.