You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I would like to cancel my recent reservation due to some health issues.

ASSISTANT: Ok. May I know your name? to check in reservation list?

USER: I am Melissa Turner.

ASSISTANT: Ok. But there is no reservation found on your name in our database. Thanks for choosing us, Have a nice day.

USER: Ok, thank you for your response.