You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Brown.

ASSISTANT:  how can i help you?

USER: Can you help me in booking my flight ticket from DEN to BOS? I need a direct flight.

ASSISTANT: Ok, may i know your travel dates?

USER: My dates of travel are 03/09 - 03/11.

ASSISTANT: Sorry, no direct flights are available.

USER: Ok, I will choose other airline. Thank you.

ASSISTANT: Thank you.