You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Jerry Gonzalez here.

ASSISTANT: Glad to know you, Jerry.

USER: I want to travel from DC-IAD to TX-DFW, can you please book me a ticket?

ASSISTANT: Sure, may I know your planned dates of journey?

USER: Sure, my preferable dates are from 08/13 to 08/15. My price limit is 500.

ASSISTANT: All flights are booked, there is no flight available for you to book the ticket.

USER: No problem.

ASSISTANT: Anything else you want from us to help you?

USER: No, thank you for your help.

ASSISTANT: Thank you for choosing us.