You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a economy class ticket to visit Central Park with my friends, can you help me with booking?

ASSISTANT: Sure, I am gleeful to assist you with the ticket reservation process. Can I know your source and destination airport codes please?

USER: Thank you. My source airport code is IAD and destination airport code is EWR.

ASSISTANT: Ok, on which name you would like to reserve a ticket?

USER: I am Patrick Hall.

ASSISTANT: Ok, can I know your departure and return journey dates please?

USER: I will fly on Sept 21 and recur on Sept 23.

ASSISTANT: Ok, please tell me your connection limit specification.

USER: I need a break in between my journey.

ASSISTANT: Ok, please give me a couple of seconds. In the meanwhile, please share your other specifications if any.

USER: Sure.

ASSISTANT: I am really sorry to inform you Patrick Hall, I didn't found any flight which is available on your preferred journey dates.

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

ASSISTANT: My pleasure to inform you. Thank you for approaching us.