You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please book a flight ticket from HOU to SFO?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My trip dates are May 12 and May 14.

ASSISTANT: May I know your name?

USER: My name is Mark Robinson.

ASSISTANT: Sorry Mark Robinson, there is no flight as per your request.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us Mark Robinson.