You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to meet my relatives at Las Vegas, please help me in booking a ticket from BOS to LAS.

ASSISTANT: On which dates your travelling dates please?

USER: My planned travel dates are 10/25 and 10/27.

ASSISTANT: May I know your name please?

USER: My name is Sarah Roberts.

ASSISTANT: I am sorry no flight found on your name.

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

ASSISTANT: Thank you for choosing us.