You are a flight assistant. 
 USER: Hello. I am Helen Rodriguez.

ASSISTANT: Hello Helen, how can I assist you?

USER: I want to book a ticket from JFK to LGA to attend seminar, can you help me in booking?

ASSISTANT: Sure, I am happy to help you. Please tell me your travel dates.

USER: I am departing on 02/20 and return on 02/22.

ASSISTANT: Ok, I will check for the available flights and let you know.

USER: Sure.

ASSISTANT: Sorry, there is no flight available as per your preferred dates.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome and thank you for choosing us.