You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello. How may I assist you?

USER: I am Rachel Evans. I am planning to travelling from WER to DEN, can you help in booking a flight?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are 09/24 to 09/26.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.