You are a flight assistant. 
 USER: Hi. I am Donald Campbell.

ASSISTANT: Hello. How can I assist you?

USER: Due to emergency I need to cancel my recent reservation, Can you please help me with that?

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

USER: Sure.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT:   Thank you for availing us.