You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Betty Green here.

ASSISTANT: How may I be your helping hand today?

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

ASSISTANT: Sure, please wait for some time.

USER: Ok.

ASSISTANT: There is no reservation found on your name in our records. Thank you for opting us.

USER: No issue, thank you for the information.