You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am William Smith. Please book a flight ticket on dates 07/01 and 07/03.

ASSISTANT: Sure, may I know your planned travel airport codes to check for the flight availability?

USER: My airport codes are OAK and DEN.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Here, I found a flight with 1 connection and airfare is about 100. Shall I proceed in booking with this flight?

USER: Yes, please.

ASSISTANT: In an economy class, your ticket has been confirmed for the flight 1019 in UA airlines.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.