You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am John Anderson here. I would like to book a flight ticket from CLT to IAD. Can you please help me out in booking the flight ticket?

ASSISTANT: Sure, I can help you with that. Can I know your planned trip dates?

USER: My planned trip dates are 12/03 and 12/05.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your help.