You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, May I know your good name please?

USER: I am Virginia Roberts.

ASSISTANT: How can I provide assistance to you?

USER: I want to go for lake mead tour at hoover dam bypass which is located at Las Vegas.

ASSISTANT: Ok.

USER: So, please assist me in reserving a ticket with the fare of 200.

ASSISTANT: Sure, I am here to serve you. May I know your scheduled travelling dates?

USER: My trip dates are from 12/21 to 12/23.

ASSISTANT: Can I have your boarding and landing point airport codes please?

USER: My source point is Denver, DEN. Destination code is LAS.

ASSISTANT: Let me know your connection limit.

USER: I need one stopover in between my journey.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Unfortunately there are no flights available with your specifications.

USER: That's ok, I will search with another agency. Thank you for the information.

ASSISTANT: Thank you for reaching us.