You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Phillips.

ASSISTANT: How can I assist you at this moment?

USER: I want to book a ticket from ATL to LGA. Can you help me with this?

ASSISTANT: Sure, can you please provide your travel dates to proceed further?

USER: I will start my journey on 12/16 and return will be on 12/18.

ASSISTANT: Wait a moment please.

USER: Ok, take your time.

ASSISTANT: Dennis Phillips, there are no flight services available on this route on your provided dates.

USER: Ok, not an issue.Thank you for providing information.

ASSISTANT: Thank you for contacting us.