You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I want to visit my grandmother house at Denver, DEN, can you please book a ticket from New York?

ASSISTANT: Sure, When you want to travel?

USER: I want to travel on 05/17 and return on 05/19.

ASSISTANT: Can I know your name?

USER: John Miller.

ASSISTANT: May I know your source airport code?

USER: Source is JFK.

ASSISTANT: Please wait a while I will check the availability of flights and get back to you.

USER: Sure.

ASSISTANT: Thank you for being waiting. We found a Spirit airline, flight number:1017 and the price is 100.

USER: You can proceed for booking.

ASSISTANT: Your flight ticket has been processed.

USER: Thank you.

ASSISTANT: Thank you for contating us.