You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Anthony Perez here.

ASSISTANT: How can I assist you?

USER: I want to travel LAS from EWR to attend my sister's wedding. Please, aid me to book a flight ticket.

ASSISTANT: Sure Perez, can I know the travel dates please?

USER: My travelling dates are 04/14 and 04/16.

ASSISTANT: Ok, wait a moment please.

USER: Ok, please take your time.

ASSISTANT: Sorry, there are no flights as per your request.

USER: Not an issue, anyway thank you for the help.

ASSISTANT: Thank you for approaching us.