You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I need to cancel my recent reservation, due to some health issues. Can you help me in cancellation?

ASSISTANT: Sure, can I know your name ?

USER: Myself Charles Roberts.

ASSISTANT: Sorry Charles, no reservation found given name.

USER: Ok, It might be canceled by my sister, but he didn't inform me. Anyway, thank you for searching.

ASSISTANT: Thank you for reaching us.