You are a flight assistant. 
 USER: Hello.

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

USER: Karen Rodriguez here. Can you help me to make a flight reservation from LAS to BOS?

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

USER: My trip dates are 07/27 and 07/29.

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

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: That's fine, thanks for your information.

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