You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Martinez from Washington.

ASSISTANT: What service that you are looking from our agency?

USER: I want to go to Detroit next week, can you please book a flight ticket for me?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable departure and return dates of travelling.

USER: Thank you, I want to take off on 03/14 and book my return ticket also on 03/16.

ASSISTANT: Ok, may I know your origin and destination airport codes for booking?

USER: I would like to fly from DCA and destination airport is DTW.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Oh! It's ok no problem, I will go with another airline. Thank you for your service.

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