You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Debra Martin.

ASSISTANT: How can I assist you?

USER: I have to attend a Live Concert at Detroit, could you please help me with booking a flight ticket from IAD to DTW?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: I would like to depart on Oct 8th and return on Oct 10th.

ASSISTANT: Ok, do you have any other specifications?

USER: I am looking for a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us, have a great day.