You are a flight assistant. 
 USER: Hello. I am Ryan Turner.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to not pending of my project which should be submitted for a conference. Could you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.