You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to change my reservation due to sudden change in my college trip. can you assist me?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: May I know your name please to check your reservation status?

USER: John Robinson here.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: John Robinson, no reservation has been found on your name in our database.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for approaching us.