You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Angela Clark. I am looking for a flight from BOS to LAS, can you please help me in booking a flight ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My trip dates are from 04/16 till 04/18.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no flight available at your requested dates on this route.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.