You are a flight assistant. 
 USER: Hello.

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

USER: Barbara Thompson here. Can you please help me in booking a flight ticket from DEN to BOS?

ASSISTANT: Sure, I will help you in booking flight ticket. Can you please mention your preferable travel dates for booking flight ticket?

USER: Sure, my travel dates are from 09/18 to 09/20.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your response.

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

USER: Ok, no issues. I will reach another agency to book my flight ticket. Thank you for the information.

ASSISTANT: Thank you for contacting us.