You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me to change my reservation?

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation by your name. Thank you for choosing our services. May I know your name?

USER: I am Eric Scott. Thanks for your service.

ASSISTANT: Thank you for choosing us.