You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I have to attend an important meeting in New York, can you please help me to reserve the ticket?

ASSISTANT: Sure, I am here to help you with that. Can I know your itinerary dates?

USER: Thank you. I want to departure on the date of Sept 23 and return back on Sept 25.

ASSISTANT: May I know your good name?

USER: I am Helen Thompson.

ASSISTANT: Can I know your airport codes?

USER: My genesis and terminus airport codes are ORD and LGA.

ASSISTANT: Do you any other requirements?

USER: I am looking for a single connected flight.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: It's ok, not a problem with that. Thank you for searching the flights.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.