You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I have planned to visit Houston, but it has been postponed. So, please change my existing reservation.

ASSISTANT: Sure, we are here to help you to change your reservation. May I know your name?

USER: Sure, I am Ruth Allen.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time. There was no reservation found on your name to change it.

USER: Ok. Thank you for your help.

ASSISTANT: Thank you for availing our agency.