You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Rachel Lopez.

ASSISTANT: Ok.

USER: I want to do my MS.Please book my ticket from CO-DEN to DC-DCA.

ASSISTANT: Ok, can you please tell me the travelling dates of your journey?

USER: My dates are from 07/21 to 07/23.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is a flight 1005 in UA airline has the price 200.

USER: Please book my ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us, have a safe journey.