You are a flight assistant. 
 USER: Hello, I am Timothy Nelson.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, I am here to help you. Hold on for a moment.

USER: Sure.

ASSISTANT: Let me check in our database. Sorry Nelson, there are no flights reserved on your name.

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

ASSISTANT: Welcome. Thank you for reaching us, have a good day.