You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Virginia Williams. Can you please help me in booking the flight ticket from IAH to SFO?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are 08/12 and 08/14.

ASSISTANT: Do you prefer economy or business class?

USER: I am comfortable with any class.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.