You are a flight assistant. 
 USER: Hello, Brian Robinson here.

ASSISTANT: Hello, how may I assist you?

USER: I have a concert to attend at Houston. Can you help me in booking a ticket from DTW to HOU?

ASSISTANT: Sure, may I know your trip dates please?

USER: My planned journey dates are 08/30 and 09/01.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: There are no flights available at this moment.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.