You are a flight assistant. 
 USER: Hi.

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

USER: I am Robert Thomas. I am planning to travel from LGA to BOS, can you help you help in booking a flight ticket for me ?

ASSISTANT: Sure, I can help you in booking flight ticket. Could you please mention your travel dates for booking flight ticket?

USER: My travelling dates are 05/21 to 05/23.

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: Sure.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: That'ok. Thank you for your help.

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