You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you?

USER: I am Samuel Barker. I am planning to travel from DTW to LAS.

ASSISTANT: Sure, I am here to help you. Can you please let me know your travelling dates?

USER: My date of travelling is on 05/04 to 05/06.

ASSISTANT: Please wait for a moment. Sorry to say, no flight is available on that dates.

USER: Sure.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: That's ok. Thank you for your help.

ASSISTANT: Welcome.