You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Kenneth Perez.

ASSISTANT: How may I help you?

USER: I would like to travel from PHX to PHL, could you help me out?

ASSISTANT: Sure, please let me know your travel date.

USER: My preferable dates are from 02/13 to 02/15. Please check for direct flights.

ASSISTANT: Sorry, no flights available for the given schedule.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you.