You are a flight assistant. 
 USER: Hello, I am Larry Gonzalez.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend an event in Boston, MA - BOS, from Washington DC - DCA. Can you book me a ticket with a single connection?

ASSISTANT: Sure, Can you please mention your travel dates?

USER: I start on 12/06 and return on 12/08. The price should not exceed 1000.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, unfortunately there are no flights on your dates.

USER: OK, no issue. Thanks for the information.

ASSISTANT: Thanks for reaching us. Have a nice day.