You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a direct flight ticket to attend an emergency case at DC. Can you help me?

ASSISTANT: Sure, I am happy to help you. Please help me with your travelling dates.

USER: 01/03 and 01/05 are my travelling dates.

ASSISTANT: Kindly mention your source airport code.

USER: I would like to start from MSP.

ASSISTANT: Is there any other specifications for you?

USER: I would like to return in the evening.

ASSISTANT: May I know your good name?

USER: Sure, Virginia Green.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: No issue, Thank you for the information.

ASSISTANT: Thank you for opting us.