You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to reserve a flight to travel from ORD to DEN, can you please help?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: I will travel on Apr 10th and 12th.

ASSISTANT: Ok, do you have any connection limit?

USER: I am fine with one connecting flight.

ASSISTANT: Ok, may I know your specifications?

USER: I want to fly in economy class.

ASSISTANT: Ok, please provide me your name.

USER: My name is Karen Anderson.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your route.

USER: No worries, thank you for the information.

ASSISTANT: Welcome, have a nice day.