You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Samantha Wilson.

ASSISTANT: How can I help you?

USER: After a long time I have to meet my nephew in Washington with my family to enjoy my holiday vacation. Can you please help me for booking a flight ticket?

ASSISTANT: Sure, I will help you in booking. May I know your travelling dates?

USER: My depart is on 04/20 and arrival is on 04/22.

ASSISTANT: May I know the price and connection limit?

USER: Price should not be exceeded in 200. I need single connection limit.

ASSISTANT: May I know the airport abbreviates?

USER: My airport codes are MI-DTW and DC-IAD.

ASSISTANT: Please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to tell that there are no flights found on your requested dates.

USER: Thank you for your good service.

ASSISTANT: Thank you for approaching us.