You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can I know your name?

USER: Steven Brown here.

ASSISTANT: How can I aid you?

USER: Due to an emergency, I need to change my existing reservation. Can you help me?

ASSISTANT: Sure, I can help you. We didn't found any reservation by this name.

USER: No problem, Thank you so much.

ASSISTANT: Thank you for consulting us.