You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I be at your service?

USER: I am Emma Martinez, I am looking for a direct flight from Washington to visit Defence Expo, can you book a flight for me?

ASSISTANT: Ok. May I have your journey dates?

USER: I will fly on 01/14 and return on 01/16.

ASSISTANT: Could you share me your airport codes?

USER: I like to travel from DC-IAD to CA-LAX.

ASSISTANT: There is a flight with price 200 in Frontier airline with a connecting flight in 1011 flight.

USER: I need a direct flight.

ASSISTANT: Sorry, we do not have.

USER: Ok, thank you for helping me.

ASSISTANT: Thank you for connecting us.