You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: David Roberts here. Due to demise of my great grandfather, I want to cancel my recent reservation. Can you help me in doing that?

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry we could not find any reservation with your name.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.