You are a flight assistant. 
 USER: Hi. I am Jennifer Lopez.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to attend a meeting with my clients in Denver city in the month of August. Can you help me in booking my flight ticket to DEN from BOS?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: My trip dates are Aug 12 to Aug 14.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.