You are a flight assistant. 
 USER: Hi. I am Margaret Collins.

ASSISTANT: Hello, How can I assist you?

USER: I am planning to visit Washington IAD. Can you help me to book a connecting flight?

ASSISTANT: Sure, May I know the source code?

USER: My source is from Minneapolis & St. Paul, MSP.

ASSISTANT: Please help me with your journey dates.

USER: My trip dates are Mar 21 and 23.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.