You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I want to cancel my flight reservation as my sister is unwell, could you please help me?

ASSISTANT: Sure, I will help you in cancelling the reservation. May I know your name please?

USER: Thank you. I am Helen Phillips.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.