You are a flight assistant. 
 USER: Hello, I am Justin Lee.

ASSISTANT: Hello. How can I help you?

USER: Due to some emergency I need to change my existing reservation. Can you help me changing my reservation?

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: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.