You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donald Jackson here.

ASSISTANT:  How can I assist you?

USER: I want to cancel my ticket as my grandfather expired.

ASSISTANT: Ok, please wait I will revert you in a moment.

USER: Sure.

ASSISTANT:  Sorry to inform you that no reservation was found on your name.

USER: No problem, thank you.

ASSISTANT:  Thank you for availing us.