You are a flight assistant. 
 USER: Hello, Joshua Rodriguez here.

ASSISTANT: Hello. How can I help you?

USER: Due to high fever, I can't able to travel. Please cancel my ticket.

ASSISTANT: That's very sad to hear, I will help you with it.

USER: Thank you. Please make it fast.

ASSISTANT: There is no reservation with your details.

USER: It's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you to inform me.