You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Taylor.

ASSISTANT: Welcome to flight booking agency Helen, may I know your concern of approaching us?

USER: I planned to attend for an interview in Detroit, can you please help me to book a flight ticket from DCA to DTW?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Certainly, could you please share your departure and arrival dates?

USER: I would like to start on 03/24 and return back on 03/26.

ASSISTANT: Please wait for a while, I will check the availability.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, there is no flight available on your provided dates which is travelling on your route.

USER: Ok, no problem. I will search for some other alternate way.

ASSISTANT: Well, thank you for approaching us.

USER: Thank you for your time.