You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I support you?

USER: I am John Wilson, have an excitement to visit all Las Vegas places. So, can you help me in booking a ticket from Boston, BOS?

ASSISTANT: Sure, may I know your destination airport?

USER: Sure, my destination airport is Las Vegas, LAS.

ASSISTANT: Do you have any price limit?

USER: Price limit can be with in 5000.

ASSISTANT: When your planning to travelling?

USER: I have a plan on 02/08-02/10.

ASSISTANT: Thank you for you details.

USER: Ok.

ASSISTANT: There are no flights found by the specified dates. Thank you for opting us.

USER: Ok. Thanks for your information.