You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am Cynthia Carter. I want to book a flight ticket to Houston for a birthday party. Please make my reservation from Dallas TX-DFW.

ASSISTANT: Sure, May I know the destination code?

USER: My landing airport code is TX-IAH.

ASSISTANT: Please help me with your travel dates.

USER: 12/10 is my starting date. My return date to Dallas is on 12/12.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Its ok, I will search for other alternative. Thank you for your effort.

ASSISTANT: Thank you for opting us.