You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: I need to buy a plane ticket from PHX to DTW. Please help me in that.

ASSISTANT: Sure, do you need a lay by in between the journey?

USER: I need a direct flight to fly.

ASSISTANT: On which dates would you like to travel?

USER: My journey dates are from Sept, 11 to Sept, 13.

ASSISTANT: Can I know your good name please?

USER: Edward Hall.

ASSISTANT: Ok, please wait for few minutes.

USER: I prefer to return in the evening.

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

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.