You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Brenda Lewis. I would like to book a ticket to Charlotte, can you please help me out?

ASSISTANT: Sure, can you help me with the travel dates?

USER: I am travelling on these dates 10/17 and 10/19.

ASSISTANT: Please share your airport codes?

USER: I am flying from DCA to CLT.

ASSISTANT: Lewis, there is no flight available on your requested dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome.