You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Clark.

ASSISTANT: How may I serve you?

USER: I would like to travel from LAS to DEN. Could you please help me to book a ticket?

ASSISTANT: Sure, I am here to help you with that. May I know your trip dates to book a flight?

USER: My travelling dates will be on 06/27 to 06/29.

ASSISTANT: Ok, please wait for a moment. Let me check for the flight availability.

USER: Ok.

ASSISTANT: Sorry, there are no flights available for you in this route as per your travelling details.

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

ASSISTANT: Thank you for consulting us.