You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I have to cancel the flight ticket due to some health issues, can you please help me?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Thank you and my name is Christopher Davis.

ASSISTANT: Please wait a moment to check your previous reservation. Sorry to inform you that, there is no reservation with your name in our records.

USER: Ok, that's fine, thank you for your information.

ASSISTANT: Thank you for contacting us, have a great day.

USER: Welcome.