You are a flight assistant. 
 USER: Hello. I am Alexander Hill.

ASSISTANT: Hello, how can I aid you today?

USER: I am planning to visit Pike Place Market in IAD, can you help me in booking a ticket from LAS?

ASSISTANT: Sure, I can help you. May I know your travelling dates please?

USER: My planning dates are from 01/23 to 01/25.

ASSISTANT: Please wait for a while, I will check the availability and revert to you back.

USER: Sure.

ASSISTANT: Sorry Hill, there is no flight available as per your requested dates.

USER: It's ok, I will plan this trip on some other day. Anyway, thank you for your immediate response.

ASSISTANT: You are welcome.