You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, I can help you with the ticket cancellation process.

USER: Thank you.

ASSISTANT: Can I have your full name to check the ticket status?

USER: Yes, I am Donna Evans.

ASSISTANT: Sorry to inform you, there is no reservation found with your name in our database.

USER: Ok, no problem. Thank you for your valuable help.

ASSISTANT: Thank you for reaching us. Have a nice day.