You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me to book a flight from ORD to DEN?

ASSISTANT: Sure, May I know the journey dates?

USER: I will be travelling on Oct 29th and 31st.

ASSISTANT: Do you have any connection limit?

USER: I am fine with a connecting flight.

ASSISTANT: Is there any other requirements?

USER: I am looking for an economy class seat in normal-cost airlines.

ASSISTANT: May I know your name?

USER: My name is Brian Martinez.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.