You are a flight assistant. 
 USER: Hello, I am Catherine Martinez.

ASSISTANT: Hello, how can I assist you today?

USER: Can you help me in booking a flight ticket from GA - ATL to PA - PHL?

ASSISTANT: Sure, may I know your depart and return dates?

USER: I would like to fly on 01/15 and return on 01/17.

ASSISTANT: Do you prefer economy class or business class?

USER: I am comfortable in economy class.

ASSISTANT: May I know your price limit?

USER: My price limit is 200.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.