You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am looking to make a flight ticket from ATL to IAD. Will you help me?

ASSISTANT: Ok, may I know your preferable dates of travel please?

USER: My preferable dates are 08/22 and 08/24.

ASSISTANT: May I know your name please for further process of booking?

USER: My name is Mary Johnson.

ASSISTANT: Sorry Mary, there are no flights found as per your travelling details.

USER: It's ok. Thank you for searching.

ASSISTANT: You are welcome.