You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, may I know your name please?

USER: I am Anna Campbell.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.