You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to book a flight ticket from PHX to OAK?

ASSISTANT: May I know your travel dates?

USER: Ok, please book a ticket for the dates July 11th and 13th respectively.

ASSISTANT: Do you have any connecting limit preferences?

USER: Please check for a direct flight to my route.

ASSISTANT: Is there any other concern?

USER: Please check for the flight which depart during afternoon.

ASSISTANT: May I know your name please?

USER: My name is Jack Miller.

ASSISTANT: No flights found as per your preferences in our database.

USER: That is ok, thank you for assisting me.