You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you?

USER: I am Sandra Jones. I would like to attend a seminar on social issues in pioneer plaza at Dallas & Fort Worth, DFW. Can you please reserve my flight ticket on 03/24?

ASSISTANT: Sure, May I know the source code?

USER: My source point is Los Angeles, LAX.

ASSISTANT: Please help me with your return date.

USER: I would like to return from Dallas on 03/26.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.