You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Benjamin Wright here.

ASSISTANT: Benjamin, what can I do for you?

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

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, my preferable dates for travel are 01/28 to 01/30.

ASSISTANT: Can you please let me know your travelling places of your journey?

USER: I want to visit Philadelphia. So my airport codes are LAX to PHL.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Here is a flight ticket for you with UA airline and 1016 as flight number.

USER: You can book the flight ticket.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you.

ASSISTANT: Most welcome.