You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Jerry Anderson, I need a flight from Chicago, IL-ORD to meet my grand father. Can you help me to book a flight to Dallas?

ASSISTANT: Sure, May I know the destination code?

USER: My destination airport is TX-DFW.

ASSISTANT: Please help me with your travel dates.

USER: I will fly on 09/22 and return on 09/24.

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

USER: Ok, thanks for the information.

ASSISTANT: Thank you for opting us.