You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dennis Walker here.

ASSISTANT: How can I help to you?

USER: I need your help in booking a flight ticket from DEN to LAS for a business meet, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, can you please provide the dates?

USER: I am planning to move on 07/23 and return would be on 07/25.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry for the trouble that I am unable to find a flight to reach you destination.

USER: Oh! So sad to hear that.

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

USER: Anyway, thank you for the information.