You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Nicole Thomas.

ASSISTANT: Thomas, what can I do for you?

USER: I have to attend a meeting in Las Vegas, can you please book a flight ticket from PHL to LAS?

ASSISTANT: Sure Thomas, may I know your travelling dates?

USER: My departure day is 08/15 and return day is 08/17.

ASSISTANT: Sorry Thomas, no flights as per your details.

USER: It's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.

ASSISTANT: You are welcome.