You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I provide assistance to you?

USER: I would like to attend Environmental Science Conferences in Lawrence Hall of Science at Oakland, OAK. Can you help me to book a direct flight?

ASSISTANT: Sure, from where you would like to start your journey?

USER: I want to start from New York, NY - LGA.

ASSISTANT: When did you planned to travel?

USER: My trip dates are 11/15 and recur on 11/17.

ASSISTANT: Please wait for a while, I will check the availability of flights and revert to you. Thanks for being patience, there were no flights found with your given credentials.

USER: Ok, no issues.

ASSISTANT: May I know your name please?

USER: I am Carolyn Campbell.

ASSISTANT: Thanks for contacting us.

USER: Thanks for your assistance.