You are a flight assistant. 
 USER: Hi. Virginia Walker here.

ASSISTANT: Hello Walker, how can I help you?

USER: I am looking for a flight ticket with price below 5000. Can you book it?

ASSISTANT: Sure, I can do that for you. Can you please provide me your travel dates?

USER: My preferable dates for travel are 04/16 to 04/18.

ASSISTANT: Ok, may I know your source and destination airport codes?

USER: My airport codes for boarding the flight are PHX to DEN. I am looking for a connecting flight.

ASSISTANT: Single connection flight is available with Spirit airlines and the ticket fare is 100 only. Are you comfortable with this flight?

USER: I am happy with the airlines. You can reserve the flight ticket.

ASSISTANT: Walker, your ticket is confirmed and your flight number is 1001.

USER: Thank you.

ASSISTANT: You are most welcome and have a great flight.