You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Nancy Edwards. I have an event to attend at Philadelphia. Can you help me in booking a ticket from LAS to PHL?

ASSISTANT: Sure, I am glad to help you. Please provide me your trip dates.

USER: My planned journey dates are 03/29 and 03/31.

ASSISTANT: Sorry Nancy, there is no flights in your route.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for reaching us.