You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Hill, I want to cancel my sister's reservation as she is unwell. Can you please help me to cancel her reservation?

ASSISTANT: Sure, I will do that for you. Can you please help me with your sister's name?

USER: Sure, her name is Mary Hill.

ASSISTANT: Thank you. I will check her reservation status in our database and let you know.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry Samuel, I did not find any reservation under your sister's name in our database.

USER: That's fine. Anyway, thank you for checking.

ASSISTANT: You are most welcome, thank you Samuel for contacting our agency.