You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you with today?

USER: My name is Laura  Phillips, I want to go for my friend marriage can you please help me to book my ticket.

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are 08/11 and 08/13.

ASSISTANT: Thank you for providing. Can you please provide the source and the destination airport codes?

USER: sure, my source code is DFW and destination code is BOS.

ASSISTANT: OK, let me check that for you. Laura, I am sorry to inform you that there is no flight available at your request.

USER: OK, thank you for your help.

ASSISTANT: You are most welcome. Thank you for contacting us.