You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Scott.

ASSISTANT: How can I assist you today?

USER: I need to attend a wedding in New York. Can you book a ticket from DEN to LGA?

ASSISTANT: Sure, can you please share your travel dates?

USER: I want to travel on 07/23 and 07/25.

ASSISTANT: Let me check for the availability of flight.

USER: Ok.

ASSISTANT: Charles, I am sorry to inform you that there is no flight available at your requested dates.

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

ASSISTANT: Thank you for contacting us.