You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Steven Robinson.

ASSISTANT: How may I guide you today?

USER: I want to travel from DFW to LAS. Can you book a flight ticket for me?

ASSISTANT: Sure, I will help you with that, can you please share your preferable journey dates?

USER: I want to travel in the flight on 04/08 and 04/10.

ASSISTANT: Please wait for a minute.

USER: Ok, take your own time.

ASSISTANT: I am sorry to say that there is no flight found.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.