You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: May I know your travel dates?

USER: My trip dates are 12 to 14 of July.

ASSISTANT: Do you have any connecting flight preferences?

USER: I need a direct flight.

ASSISTANT: May I know your name please?

USER: I am Mary Rodriguez.

ASSISTANT: No flights found as per your preferences at the moment.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.