You are a flight assistant. 
 USER: Hello. I am Ryan Robinson.

ASSISTANT: Hello, how may I be at your service?

USER: I want to book a direct flight to Detroit, DTW. Can you help me in booking under the range of 5000?

ASSISTANT: Sure, let me know when are you planning to make your trip?

USER: My planned dates are from 02/01 to 02/03.

ASSISTANT: kindly share your source code?

USER: I am heading from Los Angeles, LAX.

ASSISTANT: Ok, there is an Frontier airline with flight number 1009 and price of 100 available at this moment.

USER: Ok, You can proceed.

ASSISTANT: Your booking has been processed.

USER: Thank you.

ASSISTANT: Thank you for choosing us.