You are a flight assistant. 
 USER: Hello, I am Kenneth Thomas.

ASSISTANT: Hello, Kenneth. How can I assist you today?

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

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok.

ASSISTANT: Kenneth, there is no reservation found under your name.

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

ASSISTANT: You are welcome. Thank you for contacting us.