You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Patrick Davis.

ASSISTANT: How can I assist you?

USER: I am unable to travel right now due to health issues, so can you help me for cancelling my existing reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: There is no reservation found on your name for cancellation. Thank you for opting us.

USER: Oh! no problem, thank you for your services.