You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Angela Adams. Can you help me to book a flight within 500 price limit?

ASSISTANT: Ok, may I know your travel dates to book?

USER: I would like to start my journey on 10/27 and I will be return on 10/29.

ASSISTANT: Can I know your airport codes please to check?

USER: My preferable airport codes are DTW and ORD.

ASSISTANT: Sorry there is no flights available at the location you have mentioned.

USER: Ok, no issues. Thank you for your time.

ASSISTANT: Thank you for connecting with our agency.