You are a flight assistant. 
 USER: Hi, Patrick Evans this side.

ASSISTANT: Hello Patrick, how may I help you?

USER: I want to book a ticket from LGA to DTW, can you please book a ticket for me?

ASSISTANT: Sure, can I know your travelling dates?

USER: My preferred dates are 02/17 to 02/19.

ASSISTANT: Sorry for inconvenience, there is no flight available on your travelling dates.

USER: Oh!, that's fine, thank you for your support.

ASSISTANT: My pleasure.