You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Matthew King. I want to change my existing reservation, can you help me?

ASSISTANT: Sure, wait a moment please.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found with your name Matthew King in our database.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for contacting us.