You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Stephen Edwards. Can you help me in booking a ticket from CLT to SFO?

ASSISTANT: Sure, can you please share you travel dates?

USER: My planning dates are from 10/02 to 10/04. I need a direct flight.

ASSISTANT: Let me check for the availability of flight.

USER: Ok.

ASSISTANT: Stephen, I am sorry to inform you that there is no flight available at your request .

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for contacting us.