You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jacob Allen. I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, I can help you. Please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry, no reservation is available by your name.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for choosing us.