You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am David Roberts, due to some health issue I can not start my journey. So can you please cancel my previous reservation?

ASSISTANT: Sure, wait for some time.

USER: Ok, sure.

ASSISTANT: There is no reservations found on your name.

USER: Ok, fine not an issue. Thank you for your help.

ASSISTANT: Thanks for choosing us.