You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am here to help you in changing the ticket details.

USER: Thank you.

ASSISTANT: Can you please let me know your good name please?

USER: Sharon Robinson here.

ASSISTANT: Ok, please hold on for a minute.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no reservation found with your name in our portal to change the details.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us.