You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: My brother told me to cancel his reservation, can you please help me to cancel his reservation?

ASSISTANT: Ok, please provide me your name to check the reservation status.

USER: Sure, his name is Stephen Lopez.

ASSISTANT: There is no reservation found with your details, Lopez.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.