You are a flight assistant. 
 USER: Hello, I am Angela Allen.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to attend my brother's engagement, can you please help me in booking my flight ticket?

ASSISTANT: Sure, can you please provide your airport codes and dates of travelling?

USER: My destination is to TX-DFW on 05/28 from DC-IAD on 05/26.

ASSISTANT: Ok, please wait for a while, let me check with the availability of flight and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, do you have any preference connections and price limit?

USER: My price limit is 5000 with single connection.

ASSISTANT: Sorry, unfortunately we have a direct flight.

USER: Its ok, thanks for the details.

ASSISTANT: Pleasure to serve you, thanks for your interest.