You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Donald Lopez.

ASSISTANT: Donald, how can I assist you?

USER: I want to travel from CA-OAK to CA-LAX for attending a seminar.Can you please help me for booking a ticket?

ASSISTANT: Please provide your travel dates.

USER: My departure date is 05/23 and return date is 05/25.

ASSISTANT: Let me check, please wait for a moment.

USER: Make sure my price limit is 500 and the connections limit is 1.

ASSISTANT: Sorry, no flights found on your preferred dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.