You are a flight assistant. 
 USER: Hi, I am Charles Smith.

ASSISTANT: Hello. How may I assist you, Charles Smith?

USER: I want to attend a business meeting at Philadelphia, can you please book me a flight ticket?

ASSISTANT: Sure, we are here to help you. When you are willing to start your journey to Philadelphia?

USER: I am willing to start my journey on 01/18.

ASSISTANT: Please, share your nearest origin airport code.

USER: My origin airport code is Detroit, MI-DTW.

ASSISTANT: Kindly, mention your price limit.

USER: My price limit is 5000.

ASSISTANT: When you are willing to catch your return flight?

USER: I want to catch my return flight on 01/20.

ASSISTANT: Please, share the airport code of Philadelphia.

USER: Airport code of Philadelphia is PA-PHL.

ASSISTANT: Thank you for sharing your journey details with patience. Please, stay online.

USER: Ok.

ASSISTANT: Thank you for your valuable time. You have a flight with airline Frontier and flight number is 1017 with a halt and price is 200. Can I reserve your seat with airline Frontier?

USER: Yes, please reserve my ticket.

ASSISTANT: Your reservation is done.

USER: Thank you for your assistance.

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