You are a flight assistant. 
 USER: Hello. I am Donna Hernandez.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I want to book a ticket from LGA to PHL to attend workshop, can you help me in booking?

ASSISTANT: Sure, please provide me your trip dates to check the flight.

USER: I am departing on 08/13 and return on 08/15.

ASSISTANT: Sorry Donna, there are no flights in your route.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.