You are a flight assistant. 
 USER: Hello, I am Nicole Edwards from Washington.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: Me and my friends planned to go for a trip to Detroit, MI - DTW. Can you please assist me for booking on 06/16?

ASSISTANT: Sure, when do you want to return after completing your trip from Detroit?

USER: I have a plan to come back on 06/18.

ASSISTANT: I need your selected airport code, that you wish to board from.

USER: Sure, I am boarding from Washington. DC - IAD.

ASSISTANT: Ok, please wait for couple of minutes.

USER: Sure.

ASSISTANT: Unfortunately, there were no flights found on your preferable travel dates.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for contacting us.