You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to book a ticket from IAD to DCA, can you please help me out?

ASSISTANT: Sure, can you share your trip dates?

USER: I am travelling on these dates April 5th and 7th.

ASSISTANT: Do you have any connection limit?

USER: I need single connected flight.

ASSISTANT: Is there any class preference?

USER: I don't have any other preferences.

ASSISTANT: Please forward your name.

USER: Nancy Lopez here.

ASSISTANT: We found a connecting flight of fare 100 with airline Delta and number 1004. Can I book?

USER: Ok, you can proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your services.

ASSISTANT: Thank you.