You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I assist you today?

USER: I am Virginia Phillips. I would like to book a flight ticket from Houston to overview of city in Detroit. Can you please help me in booking?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: My depart will be on 09/08 and arrival on 09/10.

ASSISTANT: Could you please provide the airport codes?

USER: My origin code is TX-IAH and destination code is MI-DTW.

ASSISTANT: Ok, let me check for the availability of flight on this route.

USER: Sure.

ASSISTANT: Virginia, I am sorry to inform you that there is no flight available at your requested dates.

USER: Ok, no worries at all. Thank you for your kind help.

ASSISTANT: You are welcome. Thank you for contacting us.