You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Richard Lewis. Can you help me in changing my recent reservation?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure.

ASSISTANT: Richard Lewis, there is no reservation found under your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.