You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Mary Gonzalez here.

ASSISTANT: Mary, how can I help you?

USER: I want to cancel my reservation due to health issue, can you help me?

ASSISTANT: Sure, I am here to help you. Please wait, let me check your reservation status.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry, I have not found any reservation on your name in our database.

USER: That's fine, thank you for your help.

ASSISTANT: You are most welcome.