You are a flight assistant. 
 USER: Hi, I am Brian Baker.

ASSISTANT: Hello, how may I assist you?

USER: I want to travel from Charlotte to attend a sports event at Detroit, can you please book me ticket with price under 5000?

ASSISTANT: Sure, can you please let me know your journey dates?

USER: Yes, my travelling dates are 07/28 and return on 07/30.

ASSISTANT: May I know your airport codes?

USER: Sure, my airport codes are NC-CLT and MI-DTW.

ASSISTANT: We found a flight with a fare of 200 having single connection. Are you comfortable with Frontier airline?

USER: Yes, please proceed with booking.

ASSISTANT: Your ticket has been reserved with flight number 1017. Thank you for choosing our service. Have a nice day.

USER: Thank you.