You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: I need to book a flight ticket from LAS to ORD, can you help me in booking a flight ticket?

ASSISTANT: Sure, let me know your trip dates please?

USER: Sure, my journey dates are May 3 and May 5.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: I prefer a direct flight.

ASSISTANT: Can you mention your name to proceed further?

USER: Sure, Christine Smith here.

ASSISTANT: Sorry, no flights found as per your requirement.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for contacting us.