You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for the day?

USER: I am Mark White. I need to go Washington to enjoy my vacation holidays with my friends. So please help me with flight ticket booking from CLT to DCA.

ASSISTANT: Sure, I am here to help you with that flight ticket booking. May I know your journey dates, please?

USER: Thank you. I have planned my travel dates as Jan 23 and Jan 25.

ASSISTANT: Do you have any airline preference?

USER: No, I am ok with any airlines.

ASSISTANT:  Can I know your depart and return timing?

USER: Sure, I would like to depart in the evening time and return will be in morning time.

ASSISTANT: May I know your connection limit?

USER: My at most connection limit is 1.

ASSISTANT: There is no flight on this route as per your travel dates.

USER: Oh! It is sad to hear. I should go for another agency this time. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us, have a great day.

USER: Most welcome.