You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: Please book a ticket from Washington DC-DCA to Denver, CO-DEN.

ASSISTANT: Sure, I will help you with booking. May I know your good name?

USER: My name is Brenda Gonzalez.

ASSISTANT: Please share me your planned journey dates?

USER: Depart date is 07/12 and will return by 07/14.

ASSISTANT: Do you need any halt in between your flight journey?

USER: I need direct flight.

ASSISTANT: Thank you for the details, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your journey data.

USER: Thanks.