You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you.

USER: I am Mark Williams. I am looking for a flight from SFO to IAH, can you help me out please?

ASSISTANT: Ok, May I know your travel dates?

USER: My trip dates are from 04/05 till 04/07.

ASSISTANT: Sorry, there are no flight available at your location. Thank you for choosing our agency.

USER: That's ok, no problem. Thank you for your help.