You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Paul Perez here. Could you book my ticket in a connecting flight?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are JFK and ORD.

ASSISTANT: On which dates you are planning to travel?

USER: My trip dates are Feb 18 and Feb 20.

ASSISTANT: Sorry, on these dates there is no flights available.

USER: No problem, thank you.

ASSISTANT: Most welcome.