You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight from SFO to attend family meeting. Can you help me to book a flight to DFW?

ASSISTANT: May I know your travelling dates please?

USER: I will fly on Mar 04 and return on Mar 06.

ASSISTANT: Do you have any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Mary Carter.

ASSISTANT: I am sorry no flights found on your route?

USER: Ok, thank you for the inforamtion.

ASSISTANT: Thank you for choosing us.