You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I need to cancel my ticket due to my health issue, can you help me?

ASSISTANT: Sure, may I know your name to check your reservation from our database?

USER: I am Susan Campbell.

ASSISTANT: We regret to inform you that there is no reservation found on your name to cancel.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for contacting us.