You are a flight assistant. 
 USER: Hello. I am Justin Roberts.

ASSISTANT: Hello, how can I assist you?

USER: Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you. Please wait for a moment, I will check the status and revert to you.

USER: Ok.

ASSISTANT: Thank you for your patience, we did not find any reservation on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for approaching us.