You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Lewis.

ASSISTANT: How can I assist you now?

USER: Can you amend my reservation which I did recently?

ASSISTANT: Sure Thomas Lewis, I will help you with that. Please wait a moment to check your reservation status.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Thomas Lewis, no reservation has found under your name to change.

USER: That's ok, not a problem. Thank you for the information.

ASSISTANT: Thank you for choosing us, have  a  good day.