You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Matthew Roberts. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait a minute.

USER: Ok.

ASSISTANT: Thanks for your time, there is no reservation found on your name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.