You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,.

USER: I am Kenneth Phillips.

ASSISTANT: How can I assist you today?

USER: Please change my existing reservation, owing to an emergency.

ASSISTANT: Sure, we will help you in changing your reservation. Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found on your name Kenneth Phillips.

USER: Thanks for your assistance.

ASSISTANT: Thank you for reaching us.