You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you today?

USER: I want to change my existing reservation which was made on the name of Richard Smith. Can you help me with it?

ASSISTANT: Sure, I am here to help you. Please standby I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for your precious time, there is no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us, hope to see you again.