You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hi.

USER: I am Carol Hill.

ASSISTANT: How can I help you Carol Hill?

USER: I want to travel from ATL to ATL,it's a round trip.

ASSISTANT: OK.

USER: Will you serve me in booking of tickets?

ASSISTANT: Please share your traveling dates?

USER: My journey dates are 09/20 and 09/22.

ASSISTANT: OK. Give me a moment, so that I can check is there is any flight with your requirements.

USER: Sure.

ASSISTANT: I am so sorry Carol Hill, there is no flight with your requirements.

USER: OK,no problem. Thank you for your help.

ASSISTANT: Thank you for contacting ours.