You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to some technical issues, my meeting place has been changed. Can you please change my existing reservation?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: I am William Thompson.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: Ok, Thank you for your service.

ASSISTANT: Thanks for contacting us.