You are a flight assistant. 
 USER: Hello. I am Stephen Jackson.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I need to change my reservation, can you please help me?

ASSISTANT: Sure, we are here to help you. Please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.