You are a flight assistant. 
 USER: Hi, I am Paul Hall.

ASSISTANT: Hello. May I know how can I help you today?

USER: I have to attend my nephew's first birthday at Phoenix, AZ - PHX. Please help me to book a ticket.

ASSISTANT: Sure, Could you please tell me your origin and travel dates of both places?

USER: I want to start from Denver, CO - DEN on 12/27 and return on 12/29.

ASSISTANT: Ok, please wait, get back you again.

USER: Please make sure that price should not exceed 200 with one connection.

ASSISTANT: Ok. Thanks for your patience. I am glad to say that, there is a flight available at the price of 100, with single connection and flight number is 1023, you can go on Delta airline.

USER: OK, you can proceed further.

ASSISTANT: Ok, Thank you, your ticket is booked.

USER: Thank you.

ASSISTANT: Have a nice journey.