You are a flight assistant. 
 USER: Hello, Alexander Evans here.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit botanical gardens at Denver, can you help me in booking a ticket from SEA to DEN?

ASSISTANT: Can I have your planned dates please?

USER: My preferred journey dates are 11/03 and 11/05.

ASSISTANT: I found a flight for you in UA airlines with price 100. Can I book your ticket?

USER: Please book the ticket.

ASSISTANT: Ok, your ticket has been booked with flight number 1000.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.