You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rachel Williams here.

ASSISTANT: Rachel Williams, how can I render you today?

USER: I want to attend a Seminar in New York. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travelling dates are 06/30 and 07/02.

ASSISTANT: Ok, can you please provide your source and destination airport codes?

USER: My airport codes are ORD and EWR.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok, I want to departure on morning time in single halt flight.

ASSISTANT: Sorry Rachel Williams, there are no flights available on your requested dates.

USER: Anyway, thanks for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.