You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Karen Martinez. Can you help me to book a flight ticket from ORD to LAS?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: My preferable journey dates are Feb 04 and Feb 06.

ASSISTANT: Do you have any other specifications?

USER: I would like to return back in the afternoon time.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for approaching us.