You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Margaret Allen.

ASSISTANT: How are you doing, Allen?

USER: I am doing fine. I want to travel from ATL to CLT. Can you please help me with booking a flight ticket?

ASSISTANT: That's good to hear from you. Yes sure, can you please provide your travelling dates?

USER: Sure. My departure date is 06/25 and returning date is 06/27.

ASSISTANT: Thank you for your information. But sorry, there is no flight available for you.

USER: It's ok.No problem. Thank you.

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