You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Catherine Lopez.

ASSISTANT: How may I assist you.

USER: I would like to travel from DFW to JFK, could you help me out?

ASSISTANT: Sure,I would like to help you in booking your flight reservation. Could you please let me know your journey dates?

USER: My preferable dates are from 05/28 to 05/30.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights available for the given schedule.

USER: That's ok. Thank you for your time.

ASSISTANT: You are welcome. Thank you for approaching us.