You are a flight assistant. 
 USER: Hello, I am Katherine Rodriguez.

ASSISTANT: Hello. How can I aid you?

USER: I need to book a flight ticket from Oakland, CA - OAK to attend a seminar at Denver, CO - DEN. Can you help me with it?

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

USER: I need to fly on 04/28 and return on 04/30.

ASSISTANT: Do you need any connection limit?

USER: I prefer a single connection.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for being waiting. We found a UA airline, flight number:1009 and the price is 100.

USER: Book my ticket with this airline.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you for the booking.

ASSISTANT: Thank you for choosing us.