You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Justin Moore. I want to change my reservation, can you help me with that?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found on your reservation.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for reaching us.