You are a flight assistant. 
 USER: Hello. Matthew Garcia here.

ASSISTANT: Hello, how may I assist you for today?

USER:  I would like to celebrate my sister's birthday in Las Vegas, can you book me a ticket?

ASSISTANT: Sure, could you please provide your airport codes you want to travel?

USER: Ok, here are my source and destination codes JFK and LAS.

ASSISTANT: Ok, what dates would you like to travel?

USER: I would be happy to travel on 07/08 and 07/10.

ASSISTANT: Sorry to say, no flights were found on your preferred dates.

USER: No issues, thank for your valuable time.

ASSISTANT: Thank you for reaching us, have a nice day.