You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Betty Garcia. I need to change my recent reservation due to postpone of my seminar. Could you please help me in doing that?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Thank you. Sure.

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

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.