You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER: I am planning for a holiday trip to ATL, so can you help me to book a flight on 10/18?

ASSISTANT: Ok, may I know the origin airport code please?

USER: My source airport code is EWR.

ASSISTANT: May I know your name please?

USER: My name is Timothy Anderson.

ASSISTANT: Do you want any return ticket?

USER: I would like to return on 10/20?

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Timothy, there are no flights found on your requested dates.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for your time.

ASSISTANT: You are welcome.