You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Raymond Baker, can you help me to book a flight from AUS to LGA?

ASSISTANT: Sure, I am here to help you out. Please share me your trip dates.

USER: Yes, my departure date is 08/14 and return date is 08/16.

ASSISTANT: Sorry Baker, there is no flight in your route.

USER: Thank you for checking, no problem I will try again next time.

ASSISTANT: Thank you for reaching us.