You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am planning to visit Las Vegas, can you please book me a ticket from ORD to LAS?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your travelling dates to book a flight ticket?

USER: My planned dates of journey are Aug 19 and Aug 21.

ASSISTANT: May I know your name?

USER: My name is William Garcia.

ASSISTANT: Do you have any other specifications?

USER: I prefer connecting flight for this trip.

ASSISTANT: Ok, wait for some time I will check and get back to you.

USER: Sure, I will wait for your information.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thanks for approaching us.