You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to visit Lake Merritt at Oakland, could you please help me with booking a flight ticket from SEA to OAK?

ASSISTANT: Sure, please provide your itinerary dates.

USER: I would like to depart on Oct 21st and return on Oct 23rd.

ASSISTANT: May I know your name?

USER: I am Sharon Garcia.

ASSISTANT: Which class do you prefer?

USER: I am comfortable with any class.

ASSISTANT: Do you have any preferences?

USER: I am looking for a connecting flight. And make sure that my depart time must be morning.

ASSISTANT: Let me check for a best flight on your route.

USER: Sure.

ASSISTANT: Sorry Sharon Garcia, no flight is available from Seattle in the morning.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.