You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jonathan Thompson here.

ASSISTANT: How can I assist you now?

USER: Please book my ticket from DCA to HOU.

ASSISTANT: Sure Jonathan Thompson, can I have your travel dates please?

USER: My trip dates are 07/04 and 07/06.

ASSISTANT: Ok Jonathan Thompson, please wait a moment.

USER: Sure.

ASSISTANT: There is a flight with connection 1 and price of ticket is 600 in Delta airlines. Is it ok for you?

USER: I can afford 500 for my ticket.

ASSISTANT: Sorry Jonathan Thompson, no flight is available to you with price of ticket 500.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us, have a good day.