You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Samantha Martinez. Please book a flight ticket to Minneapolis & St. Paul from Philadelphia within the fare of 200.

ASSISTANT: Sure, I am here to help you in booking process. Could you please share your travel dates?

USER: I want to depart on 7th Mar evening and return back on 9th Mar.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: PHL and MSP are my journey airport codes.

ASSISTANT: Please wait a moment. Sorry, no flights are available on your preferable travel dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us, have a great day.