You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: Please book a flight ticket from DCA to reach LGA to attend for a conference.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Mary Rodriguez.

ASSISTANT: Please share your travel dates?

USER: Sure, my travelling dates are July 12 and 14.

ASSISTANT: Are you looking for any connections to travel?

USER: I am comfortable with any flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Shall I proceed.

USER: Sure.

ASSISTANT: No flights found as per your preferences.

USER: Ok, thanks for your information.

ASSISTANT: Thank you, have a great day.