You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please change my reservation?

ASSISTANT: Sure, I am here to help you. Can you please help me with the name on the ticket?

USER: Jack Nelson here.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Jack Nelson, regret to inform that there is no active reservation found in our database to change.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.