You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Raymond Evans.

ASSISTANT: How can I help you?

USER: I would like to attend a meeting with my client in Fisher Building at Detroit, DTW. Can you please help me in booking a flight ticket?

ASSISTANT: Sure Evans, please provide me your planned journey dates.

USER: Sure, my planning dates are from 01/25 till 01/27.

ASSISTANT: May I know your source airport code please?

USER: I want to fly from BOS to DTW.

ASSISTANT: Evans, there are no flights available at this moment.

USER: That's ok, anyway thank you for your information.

ASSISTANT: Thank you for contacting us.