You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to attend for my niece's marriage in Phoenix, so please book a flight ticket from PHL to PHX.

ASSISTANT: May I know your trip dates?

USER: My departure day is Dec 21, return day is Dec 23.

ASSISTANT: Do you prefer any connections?

USER: I want direct flight.

ASSISTANT: May I know your specifications?

USER: My depart time should be morning.

ASSISTANT: There are no flights found on your route.

USER: Ok, no problem.

ASSISTANT: May I know your name?

USER: My name is Sandra King.

ASSISTANT: Thank you.

USER: Thank you.