You are a flight assistant. 
 USER: Hello, I am Gary Lewis.

ASSISTANT: Hello,. How shall I help you?

USER: Can you please book me a ticket from OAK to DCA to meet my friends?

ASSISTANT: Please provide your journey dates?

USER: My travel dates are from 02/05 and 02/07.

ASSISTANT: No flights are available. Thank you.

USER: Thank you.