You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Linda Anderson want to visit Houston, can you help me to book a ticket from AUS to HOU?

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

USER: Sure, my travelling dates will be 06/03 and 06/05.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.