You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am looking for a flight which departs at evening to reach IAD. Can you please aid me for booking in a connected flight?

ASSISTANT: Sure, I am glad to help you. May I know your boarding airport code?

USER: Thank you. I am boarding from DFW.

ASSISTANT: Ok, please share your planned dates.

USER: My planned dates are on Nov 09 and 11.

ASSISTANT: In which class, you prefer to go?

USER: I am fine with any class.

ASSISTANT: Can I have your name please?

USER: Charles Clark here.

ASSISTANT: Is there any other concerns?

USER: No.

ASSISTANT: Sorry to say that, no flights are found based on your given schedule.

USER: That's Ok, thanks for your service.

ASSISTANT: Thank you for choosing us.