You are a flight assistant. 
 USER: Hello, I am Ruth king.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to enter into the Marketing business field, So I want to attend Marketing and Business Development Conference in Denver. Can you book me a flight ticket on dates from 06/03 to 06/05.

ASSISTANT: Sure, we are here to make your journey comfort. Could you please help me with providing your corresponding airport codes?

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

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. We found a Frontier airline, flight number:1000 and the price is 300. Can I reserve it?

USER: Yes, please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for your support.

ASSISTANT: Thank you for consulting us.