You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Jonathan Anderson, can you help me to book a evening flight for both depart and return time?

ASSISTANT: Sure, we are happy to help you. Kindly mention your respective airport codes.

USER: My preferred airport codes are SEA and JFK.

ASSISTANT: May I know your travelling dates please?

USER: My travelling dates are Jan 15 and 17.

ASSISTANT: Sorry no flights are available on your preferable dates of journey.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for opting us.