You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Nelson.

ASSISTANT: Nelson, how can I aid you?

USER: I am planning to visit Las Vegas, can you please book me a ticket from BOS to LAS?

ASSISTANT: Sure, I will help you with that. Could you please let me know your travel dates?

USER: My planned dates of journey dates are from 09/25 to 09/27.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry Nelson, there are no flights available on 09/25 from BOS to LAS.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are welcome and thank you for contacting us.