You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Samuel Green.

ASSISTANT: How may I assist you?

USER: I have a doctor appointment for my health checkup at Phoenix, please book me a ticket.

ASSISTANT: Sure, can I know your source and destination?

USER: Yes, my airport codes are DEN and PHX.

ASSISTANT: Ok, could you tell me your travelling dates?

USER: My depart and return dates are 11/16 and 11/18.

ASSISTANT: Ok, give me a moment. I have found a flight for you with a price of 100 and a connection of 1. Can I proceed?

USER: That's perfect, please proceed.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you for booking.

ASSISTANT: The flight number is 1001 of Frontier airlines. You are welcome.