You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Moore.

ASSISTANT: How may I assist you at this moment Moore?

USER: I am planning to cancel my recent reservation, due to health issue.

ASSISTANT: Sure, I am glad to help you with that.

USER: Can you please cancel my ticket? Thank you.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Sure, I will wait.

ASSISTANT: We regret to inform you that there is no reservation in our database on your name.

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

ASSISTANT: Thank you for reaching to our services, hope you have a great day.