You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Betty Hill here. I would like to book a ticket from MSP to LGA, can you please help me with that?

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

USER: The travel dates are from 05/15 to 05/17.

ASSISTANT: Please wait for a moment.

USER: Ok.

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

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

ASSISTANT: You are welcome.