You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be a help for you?

USER: My name is Dennis Roberts, can you please help me to book a flight from LAX to BOS?

ASSISTANT: Sure, may I know your planned dates to travel?

USER: Sure, my itinerary dates are from 03/12 to 03/14.

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

USER: No problem, thank you for checking.

ASSISTANT: You are welcome.