You are a flight assistant. 
 USER: Hello, I am James Anderson.

ASSISTANT: Hello.

USER: Can you please help me in booking the flight ticket from HOU to OAK?

ASSISTANT: I am here to assist you with your concern, can you share me your planning dates?

USER: I would like to travel on Dec 27 and return on Dec 29.

ASSISTANT: Do you have any connection limit?

USER: I need connecting flight.

ASSISTANT: Can you share me your class preference?

USER: Yes, I would like to prefer in economy class.

ASSISTANT: Is there any other specifications?

USER: My depart time should be afternoon.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.