You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you now?

USER: As I am a scientist, I want to attend science festival with my students at Seattle. Can you help me to book a ticket from DEN to SEA?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you please provide your preferable departure and return dates of travelling?

USER: My trip dates are 07/10 and 07/12.

ASSISTANT: Is there any additional requirements do you want?

USER: Price should not cross 500.

ASSISTANT: Please wait a moment to check the flights on your route.

USER: Sure.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 200 is provided by Frontier airlines. Shall I proceed with this?

USER: Go ahead.

ASSISTANT: Can I know your name to book this flight ticket?

USER: Jonathan Hill here.

ASSISTANT: Ok, your ticket has been booked in flight number 1015 in economy class.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a great journey.