You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I assist you?

USER: Please book a flight ticket from IAH to ORD.

ASSISTANT: Sure, to book a ticket may I know your travelling dates?

USER: My trip is from Dec 30th to Jan 1st.

ASSISTANT: Do you have any other requirements?

USER: Yes, I prefer a lay off in between my journey.

ASSISTANT: Can you please share me your name?

USER: Christopher Scott here.

ASSISTANT: Unfortunately there is no flights found with your matching information.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for availing us.