You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Ronald Moore.

ASSISTANT: Ok.

USER: Could you please help me to book a ticket to IAH from SFO?

ASSISTANT: Sure. May I know your travelling dates?

USER: Sure, my trip dates are from 05/29 to 05/31.

ASSISTANT: Unfortunately, no flights found as per your planned dates.

USER: That's fine. Thank you for helping me.

ASSISTANT: Thank you for contacting us.