You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Steven Hill.

ASSISTANT: How may I assist you now?

USER: I want to change my existing reservation, can you please help me with that?

ASSISTANT: Steven Hill, please allow me to check with your booking.

USER: Ok.

ASSISTANT: Sorry to inform you, but there is no active reservation under your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching our services.