You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Katherine Hernandez.

ASSISTANT: Katherine Hernandez, how may I aid you?

USER: I need to book a flight ticket from DCA to OAK, Can you please help he for booking?

ASSISTANT: Sure, please share your itinerary dates.

USER: I would like to travel on 11/18 to return on 11/20.

ASSISTANT: Do you have any specifications?

USER: I need a  connecting flight.

ASSISTANT: At what time do you want to travel?

USER: I would be return on afternoon.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.