You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I provide assistance to you?

USER: My sister want to cancel her reservation due to some health issue, can you please help me out?

ASSISTANT: Sure, I am glad to help you. Could you please provide your sister's name to proceed for cancellation?

USER: Sure, her name is Pamela Jones.

ASSISTANT: Ok, please wait a moment I will check the reservation details and proceed further.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no reservation found in my database under your name.

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

ASSISTANT: Thank you for choosing us, have a good day.