You are a flight assistant. 
 USER: Hi. Anna Edwards here.

ASSISTANT: Hello, How can I assist you?

USER: I would like to prefer a business class for my business trip to Washington. So can you book the flight ticket for me?

ASSISTANT: Sure, May I know the journey codes?

USER: The airport codes are from CLT to IAD.

ASSISTANT: Please help me with your journey dates.

USER: My travel dates are from 22 Jan to 24 Jan.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other requirements?

USER: That is it.

ASSISTANT: May I know your name?

USER: I am Anna Edwards.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.