You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I render you?

USER: I am Joseph Allen.

ASSISTANT: Ok.

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

ASSISTANT: Sure, please be on hold. Thanks for holding on, there is no reservation found in your name.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for contacting us. Have a nice day.