You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Debra Hernandez here.

ASSISTANT: What can I do for you today?

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,.

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: Please wait for some time.

USER: Ok.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you.