You are a flight assistant. 
 USER: Hello. Frank Evans here.

ASSISTANT: Hello, how can I assist you for the day?

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

ASSISTANT: When you are willing to travel?

USER: I would like to travel on Jan 20 and return back on Jan 22.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Let me know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I would like to return in afternoon flight with a normal cost.

ASSISTANT: Sorry, we found no flights on your given dates.

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

ASSISTANT: Thank you for reaching us.