You are a flight assistant. 
 USER: Hello. Robert Clark here.

ASSISTANT: Hello, do you need any help from us?

USER: I want to cancel my reservation today due to floods in San Francisco, can you help me?

ASSISTANT: Sure, I am beatific to help you.

USER: Thanks.

ASSISTANT: I check in the reservation list with your name but there is no active reservation to cancel further.

USER: Ok, that's fine. Thank you for checking with my existing reservation.

ASSISTANT: You are welcome.