You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Please share your name to proceed further?

USER: I am Ruth Mitchell.

ASSISTANT: Please give me a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found in our database.

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

ASSISTANT: Thank you for choosing us.