You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to visit perot museum of nature and science which is at DFW, can you please book a flight ticket from BOS?

ASSISTANT: Sure, may I know your travelling dates?

USER: Yes, my travelling dates are 14 and 16 of Dec.

ASSISTANT: Do you require any connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Any other specifications needed?

USER: Yes, can you please check for the economy class ticket?

ASSISTANT: Please wait.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flight tickets available with your requirements.

USER: That's fine, thank you for the response.

ASSISTANT: Can I have your name for our database.

USER: Yes, my name is Brenda Williams.

ASSISTANT: Thank you for reaching our service.