You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Myself Lisa Scott. Due to some entrepreneurship meeting this week, I am going to change my reservation. Can you please help me for this?

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Ok, I will wait for your kind response.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: Not an issue, anyhow thank you very much for your kind information.

ASSISTANT: You are welcome, thank you for opting us. Have a nice day.