You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Myself Donna Thomas. I am looking for flight from CLT to IAD, can you help me in booking the flight ticket?

ASSISTANT: Please share your preferred travel dates.

USER: Sure, my travel dates are 10/23 and 10/25.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Ok, take your time.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok no problem, thank you for the information.

ASSISTANT: Thank you for opting us. Have a nice day.