You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Pamela Hill. I have to change my existing reservation due to postpone of my sports event. Could you please help me?

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

USER: Ok.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.