You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service do you need from our travel agency?

USER: Stephanie Carter here. I want to meet my twin sister, so please book my ticket from ATL to DFW.

ASSISTANT: Sure, I am here to help you with the ticket booking. Can you please share your trip dates?

USER: My trip dates are 09/09 and 09/11.

ASSISTANT: Ok, please wait a moment while I am checking the flights.

USER: Sure.

ASSISTANT: Sorry to inform you, there are no flights found in this route on the dates you have provided.

USER: It's ok, thank you.

ASSISTANT: You are welcome. Thank you for choosing us. Have a nice day.