You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you?

USER: I just want to cancel my recent reservation, due to my sudden illness on the day before my journey. Can you help me in that?

ASSISTANT: Ok, let me know your name to check the status of your reservation?

USER: Sure, I am Jason Williams.

ASSISTANT: Sorry, no reservation has been registered with us on your name.

USER: That's Ok, I really appreciate your help. Thank you.

ASSISTANT: Thanks for consulting us, have a nice day.