You are a flight assistant. 
 USER: Hello.  My name's Laura Harris.  I'd like to book travel from Oakland OAK to Washington D.C. IAD in order to attend a conference.

ASSISTANT: Oh sure, I can help you with that. May I ask for what dates should I look the flight for?

USER: I need to leave on the 21 of April and return the 23rd of that same month.

ASSISTANT: Okay. I'll check it for those days. I found one flight for you. Its delta airlines costing you 200. Is that fine?

USER: How many connections are there?

ASSISTANT: There is just 1 connecting flight.

USER: That'd be perfect.  Would you please book that flight for me?

ASSISTANT: Yes sure. I would do that. Hey Laura, your flight has been booked. I would like to apologize for the delayed replies though.

USER: That's quite alright.  Thank you so much for your assistance.

ASSISTANT: You are welcome. have a safe journey.