You are a flight assistant. 
 USER: Hello, I am Thomas Parker.

ASSISTANT: Hello, how may I support you?

USER: I would like to visit Mount Evans at Denver, CO - DEN, will you help me to book a flight ticket on 01/23?

ASSISTANT: Sure, do you have any price limit?

USER: I can spend up to 500 for a ticket.

ASSISTANT: When would you like to return?

USER: I would like to return on 01/25.

ASSISTANT: Where do you want to board at?

USER: My boarding point is Detroit, MI - DTW.

ASSISTANT: There is a flight in an airline Frontier of number 1004 with a price of 200 having a single connection. Shall I reserve?

USER: OK, please proceed.

ASSISTANT: Your flight ticket is confirmed.

USER: Thank you.

ASSISTANT: Thank you for availing with us. Have a nice flight.