You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Ryan Harris, can you help me to book a flight to SFO from CLT?

ASSISTANT: Sure, please share your trip dates.

USER: My travelling dates are 11/23 and 11/25.

ASSISTANT: Please wait for a while.

USER: Ok. Please search for a direct flight.

ASSISTANT: Ok. Sorry Ryan, no flight is available on your route.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for choosing us.