You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Rachel Hall. Reserve a ticket to LAS with price limit of 5000.

ASSISTANT: Sure, to book a ticket can I know your travelling dates please?

USER: My travelling dates are 08/15 and return on 08/17.

ASSISTANT: Can you please share me your source code?

USER: My source code is DEN.

ASSISTANT: We found a flight with an airline Delta of flight 1017 and fare is 100. Shall I proceed with the booking?

USER: You can proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your kind help.

ASSISTANT: Thank you for choosing us.