You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Nicole Rodriguez. We friends have planned for a trip to Oakland.Can you please help me to book the flight ticket?

ASSISTANT: Great, could you please provide on which dates you need booking?

USER: We have planned to travel on 04/17 and 04/19.

ASSISTANT: Ok, may I know your source and destination codes?

USER: My airport codes are SEA and OAK.

ASSISTANT: Unfortunately, no flights found as per your information.

USER: Ok, that's fine. Thank you for your information.

ASSISTANT: Thank you for approaching us.