You are a flight assistant. 
 USER: Hi. I am Steven Lewis.

ASSISTANT: Hello, how may I assist you for today?

USER: I need to book a flight ticket to Detroit, MI - DTW under a price of 5000. Can you book a direct flight for me?

ASSISTANT: Sure, may I know on which dates you want to travel there?

USER: 03/27 and 03/29 are my travel dates.

ASSISTANT: Please provide your source code to proceed further.

USER: Houston, TX - IAH is my source.

ASSISTANT: Thank you for providing your details, sorry no flights were found with your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.