You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Mark Williams, can you help me to book a flight with 1 connection?

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My preferable airport codes are LAS and JFK.

ASSISTANT: Ok, may I know your trip dates?

USER: My travelling dates are 04/23 and 04/25.

ASSISTANT: Sorry, no flights found on your preferable dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.