You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: I am here to help you in changing your reservation. Can you please provide your name for checking the reservation status?

USER: Steven Turner here.

ASSISTANT: Please wait while I will check the reservation status.

USER: Ok.

ASSISTANT: Sorry for the trouble which is caused to you, I have not found any reservation on your name in our database.

USER: Not an issue. Thank you.

ASSISTANT: You are welcome, thank you for the information.