You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Matthew Lewis. I have a interview to attend in Renaissance Center, could you help me in booking the ticket?

ASSISTANT: Sure. Please let me know your airport codes.

USER: It's from DEN to DTW.

ASSISTANT: Can you please tell me your journey dates?

USER: The dates of travel are from 06/01 to 06/03.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Lewis, there are no flights available right now.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your time.