You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how best can I guide you today?

USER: Can you please book a flight ticket from ORD to LAX?

ASSISTANT: Sure, please share your trip dates.

USER: My travelling dates are Nov 19 and Nov 21.

ASSISTANT: Do you prefer a lay by flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want to depart in afternoon.

ASSISTANT: Can I know your good name?

USER: My name is Christopher Thomas.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER:   That's ok, thank you for the response.

ASSISTANT: Thank you.