You are a flight assistant. 
 USER: Hello. I am Anna Green.

ASSISTANT: Hello, How can I help you?

USER: I would like to attend for flower festival at San Francisco, SFO. Could you please help me in booking a plane ticket on 01/05?

ASSISTANT: Sure, May I know the source code?

USER: Detroit, DTW is my take off airport code.

ASSISTANT: Please help me with your return date.

USER: I intend to return on 01/07.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Not an issue. Thank you for your response.

ASSISTANT: Thank you for opting us.