You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Can you help me to book a flight ticket from Las Vegas, LAS to DCA?

ASSISTANT: How can I help you? Can you share your trip dates?

USER: Ok, please book a flight ticket for the dates Jan 16 and Jan 18.

ASSISTANT: Do you need any connections?

USER: Yes, I need a connecting flight.

ASSISTANT: Are there any other preferences?

USER: Ok, please book a flight which depart during morning.

ASSISTANT: May I know your name?

USER: My name is James White.

ASSISTANT: Sorry to say that, there is no flight found with your details.

USER: Ok, that is not a problem. Thank you for providing the information.

ASSISTANT: Thank you for reaching us.