You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Michael Green here.

ASSISTANT: How may I assist you today?

USER: I would like to visit San Francisco, please help me in booking a ticket from IAH to SFO.

ASSISTANT: Sure, please share me your planned journey dates?

USER: My planned travel dates are on Aug 28 and Aug 30.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Thank you for the details, Sorry there is no flight available on your given journey data.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day ahead.