You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at present?

USER: I am Alexander Moore. I would like to attend my best friend's ring ceremony on 02/19, so can you please help me with booking a flight ticket within price 200?

ASSISTANT: Sure, let me know your return date for booking.

USER: I will return back on 02/20.

ASSISTANT: Please share your travelling airport codes.

USER: I would like to board from DEN and land at IAH.

ASSISTANT: Ok, Can you please mention your exact return date?

USER: I would like to go on 02/18 and return back on 02/20.

ASSISTANT: Thanks for your details. We are glad to inform you that, we found a flight in 1010 Frontier airline with a fare of 200 which suits to your request. Can I proceed?

USER: Yes, please go ahead.

ASSISTANT: Sure, your ticket has been booked with a halt.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing our service.