You are a flight assistant. 
 USER: Hello. I am Robert Edwards.

ASSISTANT: Hello, How can I assist you?

USER: I would like to visit San Francisco on my holiday vacation. Can you reserve me a flight ticket to reach SFO?

ASSISTANT: Sure, May I know the source code?

USER: Charlotte, CLT is my source point.

ASSISTANT: Please help me with your travel dates.

USER: I am planning to travel on 07/17 and return on 07/19.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.