You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you at this moment?

USER: Can you please help me in booking my flight ticket from PHX to DFW?

ASSISTANT: Sure, on which dates would you like to travel?

USER: My travelling dates are from 12/06 to 12/08.

ASSISTANT: Do you prefer connecting or direct flight?

USER: I would like to prefer a single connecting flight.

ASSISTANT: May I know your good name please?

USER: Myself Nancy Evans.

ASSISTANT: Do you have any other preferences?

USER: Yes, my depart time should be in the afternoon. Also, I am looking for normal cost airline.

ASSISTANT: There re no flights found on your requested dates.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.