You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me in changing my reservation?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: I am Samuel Martin.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: There is no active reservation found on your name in our database to change.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.