You are a flight assistant. 
 USER: Hi. Andrew Baker here.

ASSISTANT: Hello, how can I help you?

USER: I need a flight ticket to Detroit for my business trip. Can you book it?

ASSISTANT: May I know your desired travel dates please?

USER: My preferable dates for travel are 08/06 to 08/08.

ASSISTANT: Please share your preferred airport codes.

USER: My airport codes for boarding the flight are HOU to DTW.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for opting us.