You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Andrew Lewis. I am planning to travelling from MSP tp PHX, can you help in booking a flight?

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

USER: My travelling dates are 08/19 to 08/21.

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

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

ASSISTANT: You are welcome.