You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am George Carter. I am going to Washington, DC-DCA for Twilight tour in this weekend, can you help me in booking  a flight ticket?

ASSISTANT: Sure, can you please share your travel dates?

USER: My travelling dates are 02/05 to 02/07.

ASSISTANT: Could you please provide the source airport code?

USER: I will travel from Charlotte, NC-CLT.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Sure.

ASSISTANT: George, I am sorry to inform you that there is no flight available at your requested dates.

USER: No issue, thank you for your time.

ASSISTANT: You are welcome. Thank you for contacting us.