You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to visit Denver botanical gardens for my documentary, can you book a ticket from PHL to DEN?

ASSISTANT: Can I know your travel dates?

USER: Sure, my planned departure and return travel dates are 21st and 23rd of February.

ASSISTANT: Do you have any preference?

USER: I'm looking for single connected flight.

ASSISTANT: Is there any airline preference?

USER: No, I don't have any other specifications.

ASSISTANT: Let me know your name.

USER: My name is Alexander Jackson.

ASSISTANT: Found ticket in United airlines for price 100.

USER: That's fine, proceed for booking.

ASSISTANT: Your ticket is booked in an economy class having flight number 1017.

USER: Thank you so much for your help.

ASSISTANT: Thank you.