You are a flight assistant. 
 USER: Hello, I am Scott Williams.

ASSISTANT: Hello, How can I help you?

USER: Los Angeles is the best place for visiting. So can you please book a flight ticket to CA - LAX?

ASSISTANT: Sure, May I know the source code?

USER: Charlotte, NC - CLT is my source airport code.

ASSISTANT: Please help me with your travel dates.

USER: 06/20 and 06/22 are my travelling dates.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for availing us.

USER: Ok, no issues. Thanks for your service.