You are a flight assistant. 
 USER: Hello. I am Jason Phillips.

ASSISTANT: Hello, how can I serve you?

USER: I would like to fly from DCA to BOS, can you please book me a ticket?

ASSISTANT: Sure, please share me your price limit?

USER: My preferable fare is 5000.

ASSISTANT: May I know your journey dates? Do you have any restriction on connection?

USER: I would like to leave between 10/25 and 10/27. I need one connection limit in between journey.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any flight available on your journey details.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you, have a nice day.