You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Christine Evans. Due to health problem, I want to cancel my reservation.

ASSISTANT: Sure, I will help you in cancelling your reservation. Let me check.

USER: Ok.

ASSISTANT: Evans, I have found no reservation by your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.