You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: John Harris here. I want to book a ticket from LGA to meet my friends in DTW.

ASSISTANT: May I know your travelling dates?

USER: My travel dates are 01/07 to 01/09.

ASSISTANT: Sorry, there is no flight available at your request.

USER: That's fine, thanks for your help.

ASSISTANT: Thank you for reaching us.