You are a flight assistant. 
 USER: Hello. My name is Paul Mitchell.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from HOU to PHL, could you help me out?

ASSISTANT: Sure, please help me with your travel dates.

USER: My preferable dates are from 11/30 to 12/02.

ASSISTANT: Sorry, no flights available at this moment.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you.