You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Laura Clark, can you please help me to change my reservation?

ASSISTANT: I am here to assist you with all the concerns related to flight reservation.

USER: Thank you.

ASSISTANT: Please allow me to check with your previous booking for a moment. Sorry to say, there is no reservation by your name.

USER: Ok, not a problem. Thank you for informing me.

ASSISTANT: Thank you for approaching our services, have a great day ahead.