You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am James Baker. I want to change an existing reservation due to sudden change in my trip.Can you help me with this?

ASSISTANT: Sure, please hold on for a moment.

USER: Thank you. Ok.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: No issue, I will choose other alternative.

ASSISTANT: Thank you.

USER: Thank you for the information.