You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you?

USER: Please book a ticket from Philadelphia, PA-PHL to Houston, TX-HOU.

ASSISTANT: Please mention your travel dates.

USER: My travelling dates are from 12/04 to 12/06.

ASSISTANT: May I know your good name?

USER: I am Samuel Martinez.

ASSISTANT: Samuel, no flight is available on your name.

USER: Thank you.

ASSISTANT: Thank you.