You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Sandra Allen. Can you please help me in booking my flight ticket from Los Angels LAS to Boston BOS?

ASSISTANT: Welcome Sandra.  I am happy to help you with booking a ticket for you. Can I have your travel dates please?

USER: Ok, my travelling dates are 05/ and 05/07.

ASSISTANT: Ok Sandra, please be on hold for a moment to check flight availability.

USER: I am planning to start my journey on 05/05 date.

ASSISTANT: Ok, thank you for providing. Sorry Sandra, no flight is available to you on your dates due to some weather conditions in your journey route.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for choosing us, have a good day.