You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Can you please help me in changing my existing reservation?

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

USER: I am Cynthia Robinson.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thanks for your time, there is no active reservation found in your name.

USER: No issues. Thank you.

ASSISTANT: Thank you for opting us.