You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Eric Roberts.

ASSISTANT: How can I help you?

USER: Can you please change the existing reservation?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.