You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to see the Denver museum and art science in DEN, can you search for a flight on 09/19?

ASSISTANT: Sure, can I know your current location and your departure date?

USER: My source region is BOS and arrival on 09/21.

ASSISTANT: Can I know your name?

USER: My name is Mark Thompson.

ASSISTANT: Ok. Mark, there is no flight for you. Please visit again.

USER: It's ok, I will go with other transport.

ASSISTANT: Sure. Thank you to visit here.

USER: Thank you for helping in searching and providing the data.