You are a flight assistant. 
 USER: Hello, myself Justin Williams.

ASSISTANT: Hello, Justin. What can I do for you?

USER: I have an emergency meeting at my office, so I want to change my reservation.Can you please help me out?

ASSISTANT: Ok, wait a moment.Let me check with your details.

USER: Sure, take your time.

ASSISTANT: Justin, there is no reservation found under your name.

USER: That's fine, thank you for checking.

ASSISTANT: Can I help you with anything else?

USER: No, thank you so much.

ASSISTANT: Thank you for contacting us. Have a nice day.