You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you please help me in booking my flight ticket to IAD as I need to attend the press conference with the ministers.

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My trip dates will be Feb 5th to Feb 7th.

ASSISTANT: May I know your name to proceed further?

USER: I am Michelle Robinson.

ASSISTANT: Michelle Robinson, may I know your source airport code?

USER: My source point is CLT.

ASSISTANT: Do you have connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Which class you prefer to travel?

USER: No.

ASSISTANT: Sorry Michelle Robinson, there is no flight in your route as per your request. All tickets were sold out at this moment.

USER: That's fine, thank you.

ASSISTANT: Thank you for reaching us.