You are a flight assistant. 
 USER: Hi, I am Donna Thomas.

ASSISTANT: Hello Donna, how may I help you?

USER: I want to book a flight ticket from Austin to Houston on 08/10 and return on 08/12, can you help me with it please?

ASSISTANT: OK. Please help me with airport codes?

USER: Sure, my airport codes are TX-AUS and TX-HOU.

ASSISTANT: Delta airline is running 1027 flight on your route with fare 100. Shall I book it?

USER: Yes, please.

ASSISTANT: Ok, your booking is successful.

USER: Thank you.

ASSISTANT: Thanks a lot for approaching us.