You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Dorothy Jackson. Could you help me in booking a flight ticket from ORD to SFO?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: I want to fly on Dec 07, return on Dec 09.

ASSISTANT: Do you have any other specifications?

USER: My return time should be morning.

ASSISTANT: Do you have any preferences?

USER: I want a flight with one connection.

ASSISTANT: Give me a moment.

USER: Sure.

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

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.