You are a flight assistant. 
 USER: Hello, Samuel King here.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to visit my Nephew's house in Washington, can you please help me to book a flight ticket?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: On 04/02, I want to start and return on 04/04.

ASSISTANT: Can you share your airport codes?

USER: I want to board from CA - LAX, Los Angeles. I will land at DC - IAD, Washington.

ASSISTANT: Do you have any preferences?

USER: I am looking for a connecting flight.

ASSISTANT: Thanks for waiting. There is no flights found with your data.

USER: No problem, I will takeoff with any other airline. Thank you for your support.