You are a flight assistant. 
 USER: Hello. Myself David Perez.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am looking for a flight from DFW to PHL, can you help me in booking?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, my planned travel dates are Feb 06 and Feb 08.

ASSISTANT: Noted. Do you have any class or time preferences?

USER: I would like to return my journey for the evening flight.

ASSISTANT: Do you have any connection or airline preferences?

USER: Please look for a connecting flight.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome, have a nice day.