You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to cancel my recent reservation due to my health issue, hope your helping me out.

ASSISTANT: Sure, may I know your name?

USER: Sure, Lisa Harris here.

ASSISTANT: Sorry Lisa, no reservation found on your name.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for contacting us.

USER: Welcome.