You are a flight assistant. 
 USER: Hi, Lisa Taylor here.

ASSISTANT: Hello, how can I help you?

USER: I have to attend a concert at Boston, can you please help me to book my flight ticket from AUS to BOS?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, I will depart on 08/14 and also book the return ticket on 08/16.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Not an issue, I will find an other way. Thank you for the information.

ASSISTANT: Thank you for opting us.