You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this minute?

USER: Can you please help me out with booking of a flight ticket between LAS and OAK?

ASSISTANT: Sure, may I know your itinerary dates?

USER: Thank you for accepting my request, my boarding is on Apr 26 and please book my return ticket on Apr 28.

ASSISTANT: Ok, do you have any other requirements?

USER: I would prefer single connection for my journey.

ASSISTANT: May I know your good name?

USER: Sure, my name is Timothy Martinez.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, there are no flights available based on your planned dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for approaching us.