You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you today?

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

ASSISTANT: Sure, can you please share on what dates you are planning to travel?

USER: I would like to depart on May 31st and return on June 2nd.

ASSISTANT: Ok, do you want to fly with economic class or business class?

USER: I need a economy class ticket.

ASSISTANT: Is there any airline preference for you?

USER: No, but make sure that my return time must be morning.

ASSISTANT: May I know your good name please for documentation?

USER: I am Rebecca Hill.

ASSISTANT: We are sorry to inform you that there is no flight found with your provided name in our data.

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

ASSISTANT: Thank you for connecting with us.