You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support 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. Can you help me to change my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to proceed?

USER: Sure, I am Debra Mitchell.

ASSISTANT: Ok, please hold on, let me check your reservation and let you know.

USER: Sure.

ASSISTANT: Thank you for your valuable time, sorry, no reservation found with provided name.

USER: Ok, not a problem.

ASSISTANT: Thank you for availing us.

USER: Thanks for your kind assistance.