You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Adams.

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

USER: I have to attend a musical event which is conducting in Dallas & Fort Worth. Can you please help me to book a flight ticket from DCA to DFW?

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

USER: Thank you. My departure and arrival dates are 04/17 and 04/19.

ASSISTANT: Please wait a moment to check the flights availability in your route and I will get back with a best flight for you.

USER: Sure, I will wait for your response and please make sure that the connection limit is 1.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your required number of connections.

USER: It's ok, anyways thank you for searching the flight.

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