You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please reserve a flight ticket from DFW to LAS for my business meeting?

ASSISTANT: Sure. Tell me your travel dates please?

USER: Thank you for accepting my request, my boarding is on May 01 and please book my return ticket on May 03.

ASSISTANT: Are you looking for a stopover in your journey?

USER: Yes, I am looking for it.

ASSISTANT: Any other preferences?

USER: No, thank you for asking.

ASSISTANT: Please wait.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you.