You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Nelson.

ASSISTANT: How may I assist you?

USER: I am planning to visit a Atlanta ATL from EWR. Can you find a flight ticket for me?

ASSISTANT: Sure, I am here to help you. Could you please tell me your travel dates?

USER: Sure, my itinerary dates are on 10/25 and back on 10/27.

ASSISTANT: Sorry to inform you, there are no flights found with the dates you have given.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for choosing us.