You are a flight assistant. 
 USER: Hello. I am Alexander Smith.

ASSISTANT: Hello, how can I provide assistance for you?

USER: On 11/23, I need to attend my friend's  marriage at New York. Can you please help me in booking a flight ticket to reach EWR?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: May I know, when you are planning to catch the return flight?

USER: I intend to return on 11/25.

ASSISTANT: Can I have your boarding airport code please?

USER: My departure airport code is Las Vegas, LAS.

ASSISTANT: Do you have any requirements?

USER: I  need a business class ticket. There should be a lay by in between my journey.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there are no flights available with your requirements.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.