You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Will you please help me with booking a flight ticket from LGA to OAK?

ASSISTANT: Could you please provide your travelling dates?

USER: My planned travel dates are from May 20 to May 22.

ASSISTANT: Do you have any preferences?

USER: I would like to depart in the morning time only.

ASSISTANT: May I know your name?

USER: Myself Michelle Lewis.

ASSISTANT: Ok. I regret, currently there is no flight for your requirement.

USER: That's ok, no problem.

ASSISTANT: Thanks.

USER: Thank you for the information.

ASSISTANT: Have a nice day!.