You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me with booking a flight ticket from PHX to SFO?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are from Aug 09-11.

ASSISTANT: Do you have any specifications?

USER: I prefer to fly in direct flight.

ASSISTANT: Please share me your name.

USER: Richard Rodriguez here.

ASSISTANT: Sorry, there is no direct flight at this moment.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.