You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit Dallas, please help me in booking a ticket form HOU to DFW.

ASSISTANT: Sure, may I know your travel dates?

USER: My planned travel dates are on Dec 22 and Dec 24.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Jessica King.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.