You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book a ticket from BOS to DFW.

ASSISTANT: Ok, can you please share your travel dates to get a flight for you?

USER: Travel dates are Apr, 15 and Apr, 17.

ASSISTANT: May I know your name in the meanwhile?

USER: I am Alexander Hernandez.

ASSISTANT: Sorry, there is no flight for you on your preferable dates.

USER: Thanks.

ASSISTANT: Thanks for consulting us, have a good day.