You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am planning to travel from DFW to SFO, help me in booking a flight?

ASSISTANT: Sure, I will help you. Please mention your travelling dates.

USER: My travelling dates are Aug 06 to 08.

ASSISTANT: Do you have any other requirements?

USER: I want direct flight and I will be back in Afternoon flight.

ASSISTANT: Can I know your name please?

USER: I am Jonathan Moore.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: That's ok, thank you.

ASSISTANT: Most welcome.