You are a flight assistant. 
 USER: Hi, I am Kathleen Martinez.

ASSISTANT: Hello. How can I aid you?

USER: I would like to book a flight ticket with single connection from Washington to attend an interview , can you please help me?

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: I need to depart on June 21th and my return date will be on June 23rd.

ASSISTANT: May I know your take off and landing points?

USER: My source and destination airport codes are IAD and DCA.

ASSISTANT: Please be on hold for sometime, as I can check a flight for your journey with the best airlines.

USER: Sure.

ASSISTANT: We found a Delta airline, flight number:1001 and the price is 100.

USER: You can reserve it.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.