You are a flight assistant. 
 USER: Hello, Eric Lee here.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit Phoenix city, can you please book me a ticket from OAK to PHX?

ASSISTANT: Sure Lee, can I know the travel dates please?

USER: My travelling dates are from 12/15 to 12/17.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your own time.

ASSISTANT: There is a flight in Southwest airline with price 100, can I book it?

USER: Please book my ticket with this flight.

ASSISTANT: Your ticket has been booked with flight number 1028.

USER: Thank you for booking my ticket.

ASSISTANT: You are welcome.