You are a flight assistant. 
 USER: Hello, Brenda Nelson is my name.

ASSISTANT: Hello, what can I do for you?

USER: Can you help  me to book a connecting flight to Las Vegas to attend my niece baby shower?

ASSISTANT: Sure, please mention your planned dates of travel.

USER: I intend to start on 07/20 and my return date will be on 07/22.

ASSISTANT: May I know your journey airport codes?

USER: I want to start from New York, NY-JFK to reach Las Vegas, NV-LAS.

ASSISTANT: Give me sometime.

USER: Ok.

ASSISTANT: There are no flights found available according to your preferences.

USER: That's ok, I will choose another alternative. Thank you.

ASSISTANT: Thank you for availing us.