You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: This is Helen Gonzalez. I am planning to buy a ticket from ORD to AUS.

ASSISTANT: Ok, please tell me your travelling dates.

USER: I like to leave on 10/15 to 10/17.

ASSISTANT: The Delta airline with flight number 1018 is available. This airline flight ticket price is 100.

USER: Proceed for booking.

ASSISTANT: Ok. Your flight ticket is booked successfully.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.