You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Lisa Jones. I would like to travel from IAH to JFK, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 05/25 to 05/27.

ASSISTANT: Sorry, no flights available at this moment for the given schedule.

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

ASSISTANT: Thank you for choosing us.