You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you aid me to book my ticket from PHX to DFW?

ASSISTANT: May I know your planned travel dates?

USER: My trip dates are 13 Jul and Jul 15 respectively.

ASSISTANT: May I know your connection limit?

USER: I prefer for single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: My depart time should be in the afternoon and I prefer to travel in economy class.

ASSISTANT: May I know your good name?

USER: Joseph Taylor here.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Thanks for the help.

ASSISTANT: Thank you for reaching us.