You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what service do you require from us?

USER: I am Gary Hernandez. I would like to book a ticket to Las Vegas, can you please help me out?

ASSISTANT: Sure, I can help you with that. Could you please let me know your travelling dates?

USER: I am travelling on these dates 01/16 and 01/18.

ASSISTANT: Ok, which airports do you prefer to travel?

USER: I am flying from PHL to LAS.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, there are no flights available in the dates you have given.

USER: Ok no problem, thank you for helping me.

ASSISTANT: Thank you for choosing us. Have a nice day.