You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: Could you please book a ticket from Denver, CO-DEN to San Francisco, CA-SFO.

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are from 06/30 to 07/02.

ASSISTANT: Please wait a minute. We found 1007 UA airline with single connection and price of 100. Shall I proceed with booking?

USER: I need direct flight.

ASSISTANT: Sorry, there are no flights with your specifications.

USER: Thanks for the help.

ASSISTANT: May I know your name?

USER: I am Michelle Martinez.

ASSISTANT: Thank you.