You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to celebrate my birthday at Las Vegas, could you book my ticket from New York?

ASSISTANT: Sure, may I know your travel dates please?

USER: My itinerary dates are June 7 and 9.

ASSISTANT: Please share your source airport code.

USER: My genesis and terminus airport codes are EWR and LAS.

ASSISTANT: Do you have any requirements?

USER: I want to return from LAS in the morning.

ASSISTANT: Can you mention your name to proceed further?

USER: Christopher Martinez here.

ASSISTANT: Sorry, no flights found as per your requirement.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.