You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jonathan Williams here.

ASSISTANT: How can I assist you?

USER: Can you book the flight ticket for my travel dates that is from Jan 19 to Jan 21?

ASSISTANT: Sure, let me know your airport codes?

USER: My airport codes for boarding the flight are DTW to LAX.

ASSISTANT: Do you need any specifications?

USER: I am looking for a connecting flight.

ASSISTANT: Ok, Is there any class preference?

USER: That does not matter for me.

ASSISTANT: Do you have any price limit?

USER: I am looking for a flight ticket with price below 500.

ASSISTANT: Please hold on a minute.

USER: Sure.

ASSISTANT: We found a UA airline with fare 100 and a halt in between the journey. Shall I proceed?

USER: You can book it.

ASSISTANT: Your ticket has been confirmed by flight number 1015 and an economy class.

USER: Thank you.

ASSISTANT: Thanks for choosing us.