You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I have to meet my grandmother because she is unwell, can you please book my flight ticket from LGA to JFK?

ASSISTANT: Sure, please provide your trip dates.

USER: I want to depart on 04/23 and return back on 04/25.

ASSISTANT: May I know your name?

USER: My name is Laura Nelson.

ASSISTANT: Laura Nelson, there is no flight available.

USER: Very sad to hear that, I will find an other way to travel. Thank you for the information.

ASSISTANT: Most welcome.