You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Scott Lee. Please help me in changing my existing reservation details.

ASSISTANT: Yes, I can help you with that. Give me a moment.

USER: Ok.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.