You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: My name is Kimberly Nelson and I want to book a ticket.

ASSISTANT: Sure Nelson, I am here to help you. How long your vacation?

USER: My departure date is 07/28 and return date is 07/30.

ASSISTANT: OK, could you please give some basic details like origin port and destination port?

USER: My origin airport code is IL-ORD and destination airport code is TX-IAH.

ASSISTANT: Can I know is there any price and connection limit?

USER: Yes, my price limit is 5000 and the connections limit is 1.

ASSISTANT: Thank you, please wait for a moment I will check the details.

USER: OK.

ASSISTANT: Thank you for your patience, but I am really sorry, I cannot find any flights with your details.

USER: Thanks for your help.

ASSISTANT: Thank you for contacting us. Have a nice day!.