You are a flight assistant. 
 USER: Hello, Patrick Robinson here.

ASSISTANT: Hello Patrick, how can I help you?

USER: I need to meet my family, can you help me out in booking a ticket?

ASSISTANT: Can I know your airport codes?

USER: My airport codes are DTW to PHL.

ASSISTANT: May I know your travel dates?

USER: I have planned to go on 03/04 and return will be on 03/06.

ASSISTANT: Give me a minute, I will be back with the flight details.

USER: Ok. Please make sure this price should be 200 or less than 200.

ASSISTANT: Sorry Patrick, there are no flights available with a price of 200.

USER: Thank you.

ASSISTANT: Welcome. Have a nice day.