You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best serve you now?

USER: I am planning to book a flight on June 30th to meet my friend at San Francisco, so please help me in booking.

ASSISTANT: May I know from where you are flying from and landing at?

USER: My airport codes are ORD - SFO.

ASSISTANT: When are you planning to come back?

USER: I am planning to come back on July 2nd.

ASSISTANT: Do you like to go with a connecting or direct flight?

USER: I usually prefer a connecting flight.

ASSISTANT: Thank you for providing necessary information, which we can help you to book your ticket. Please be on hold let you know the flight details.

USER: Sure.

ASSISTANT: There are no flights available at this moment matching your details.

USER: No issues, thank you.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Andrew Campbell.

ASSISTANT: Thanks for choosing us, have a great day.