You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I am Carol Adams, can you help me to book a flight from HOU on 06/20?

ASSISTANT: Sure, please share me your destination airport code.

USER: I would like to visit AUS.

ASSISTANT: When you would like to return from AUS?

USER: I will return on June 22.

ASSISTANT: Do you need any preferences?

USER: I need a economy class ticket.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We found a Southwest airline and 1003 is flight number with a fare of 100. Shall I proceed?

USER: Proceed with booking.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Thank you.

ASSISTANT: Thank you for reaching us.