You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Can you help me to book a flight ticket from SFO to JFK?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Ok, please book a ticket for the dates Sept 22 and Sept 24.

ASSISTANT: Ok, could I have your name please?

USER: Ok, my name is Deborah Green.

ASSISTANT: Ok, do you have any other requirements?

USER: Ok, please book a connecting flight.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That is not a problem, thank you for assisting me.

ASSISTANT: You are welcome, have a great day.