You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nicholas Rodriguez here.

ASSISTANT: how can I help you?

USER: I am looking for a flight ticket with price below 1000. Can you book it?

ASSISTANT: Your travelling dates please?

USER: My preferable dates for travel are 02/20 to 02/22. I am looking for a connecting flight.

ASSISTANT: May I  know your airport codes please?

USER: My airport codes for boarding the flight are SFO to PHL.

ASSISTANT: I am sorry no flights found on your route.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us.