You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from SFO to BOS to attend Innovation festival to share my ideas.

ASSISTANT: Sure, I am here to help you. Can I have your travelling dates?

USER: My trip dates are 01/09 and 01/11.

ASSISTANT: Do you have any other specifications?

USER: I need only direct flight with economy class.

ASSISTANT: May I know your good name?

USER: Alexander Harris here.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.