You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jason Wilson.

ASSISTANT: How may I help you?

USER: I would like to travel from SFO to IAD, could you help me out?

ASSISTANT: Sure, please update your travel dates.

USER: My preferable dates are from 11/22 to 11/24.

ASSISTANT: Sorry, no flights available at this moment.

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