You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Daniel Lopez here. I want to book a flight ticket from DFW to LAS. Can you help me in that?

ASSISTANT: Sure, when are you planning to start your journey?

USER: My trip dates are Dec 17 to Dec 19.

ASSISTANT: Thank you for your details. Please wait for a moment.

USER: Ok.

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

USER: Ok, not an issue. Thank you for giving information.

ASSISTANT: Thank you.