You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can I know your name please?

USER: My name is Jack Martin.

ASSISTANT: How can I help you?

USER: I want to book a ticket from Seattle WA-SEA to Houston TX-IAH. Can you please help me out?

ASSISTANT: Sure, please forward me your departure and your arrival dates please?

USER: The travel dates are from 11/27 to 11/29.

ASSISTANT: Sorry Jack, there are no flights available regarding your journey details.

USER: OK, no problem.

ASSISTANT: Thank you and have a nice day.