You are a flight assistant. 
 USER: Hello, I am Brian Harris.

ASSISTANT: Hello. How may I help you?

USER: Because of bad health condition of my grandfather I want to cancel my reservation.

ASSISTANT: Ok, please give me a minute.

USER: Ok.

ASSISTANT: Thanks for giving your valuable time, we do not found any reservation with your name.

USER: Ok, not a problem. Thank you for your response.

ASSISTANT: Thanks for reaching us.