You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Samuel Thompson here.

ASSISTANT: How may I assist you?

USER: I would like to visit Dallas and Forth Worth for attending a business meeting. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help in booking a flight. Could you please provide your preferable dates of travelling?

USER: My departure date is 06/10 and return date is 06/12.

ASSISTANT: May I know your origin and destination airport codes for booking?

USER: My airport codes are from NY-EWR to TX-DFW.

ASSISTANT: Ok, please hold on to check the flights.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that, there are no flights available with your requested dates of travelling.

USER: So sad for that. Anyway, thank you for the information.

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