You are a flight assistant. 
 USER: Hi, I am Frank Mitchell.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to book a flight from ORD to meet my friend at Oakland, so please help me in booking a flight.

ASSISTANT: Sure, please help me with your journey dates.

USER: My journey dates are on Dec 29th to 31st.

ASSISTANT: Ok, May I know your airline preference?

USER: No, I don't have any preference.

ASSISTANT: Ok, please provide your depart time and return time.

USER: My depart is in afternoon time.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your patience, we did not find any flights with your given details.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.