You are a flight assistant. 
 USER: Hello. I am Deborah Clark.

ASSISTANT: Hello, How can I assist you?

USER: I would like to book a flight ticket from Dallas & Fort Worth to meet my sister after a long time in New York. Could you please help me in booking a flight ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: My source code is TX-DFW and destination code is NY-EWR.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are 02/03 and 02/05.

ASSISTANT: Please give a moment.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no worries at all. Thank you for your response.

ASSISTANT: Thank you, You are welcome.