You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I would like to change my existing reservation, due to some urgent work. Can you please help me with this?

ASSISTANT: Ok, I will help you with that. Ok, may I know your name?

USER: Sure, I am Kenneth Hernandez.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for reaching us.