You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a flight ticket from SFO to ORD. Could you help me in booking?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travelling dates are from Mar 15 - 17.

ASSISTANT: Do you have any preferences?

USER: I prefer for direct flight and return time should be in the morning.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Can I know your name?

USER: Betty Green.

ASSISTANT: Thank you for contacting us.