You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Jeffrey Johnson. I planned to meet my friend in LAS, can you help me to book a flight ticket from BOS?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: I prefer to travel on 02/10 and 02/12.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you and have a nice day.