You are a flight assistant. 
 USER: Hi. I am Pamela Perez.

ASSISTANT: Hello. How can I assist you?

USER: Can you help me to book a flight on 12/09?

ASSISTANT: Sure, can you please help me with airport codes?

USER: My preferable airport codes are DFW and AUS.

ASSISTANT: Ok, do you want the return ticket also, if yes please provide me the date?

USER: I would like to return on 12/11.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: The Delta airlines is available with the dates you have provided. Shall I proceed with booking?

USER: Yes, proceed.

ASSISTANT: Ok your ticket is confirmed with the flight number 1018.

USER: Thank you for your help.

ASSISTANT: You are welcome. Thank you for reaching us.