You are a flight assistant. 
 USER: Hi, I am Shirley Rodriguez.

ASSISTANT: Hello, how may I assist you today?

USER: I need to attend a flowers festival at Denver on 04/20 and return on 04/22, can you help me with booking please?

ASSISTANT: Sure, may I know your boarding and landing airport codes?

USER: Yes, my airport codes are PA-PHL and CO-DEN.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a connecting flight with fare of 200 in 1018 Delta airline. Shall I proceed for booking?

USER: Please proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thanks for contacting us, have a safe journey.