You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, can you share your trip dates?

USER: Sure, my journey dates are Dec 15 and Dec 17.

ASSISTANT: Do you have any connection limit?

USER: I prefer a direct flight.

ASSISTANT: Is there any class preference?

USER: I want to fly in a economy class.

ASSISTANT: Are there any other specifications?

USER: And I would prefer well company airline.

ASSISTANT: Please forward your name.

USER: Sure, James Lee here.

ASSISTANT: Sorry, there are no flights found on your specified trip dates.

USER: Ok, no issues at all. Thank you for your assistance.

ASSISTANT: Thank you for availing us.