You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I lend a hand to?

USER: I am Kenneth Green. I would like to meet my boss at Oakland, please book my flight ticket from LGA to OAK.

ASSISTANT: Sure Kenneth Green, I am here to help you for this. Could you please share me your travel dates?

USER: Sure, I have to depart in the evening on Mar 21st and I shall return back in the afternoon on Mar 23rd.

ASSISTANT: Do you prefer any airline?

USER: No.

ASSISTANT: Is there any other specifications regarding your journey?

USER: Yes, I prefer for a single connection flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Not an issue. Thank you for the information.

ASSISTANT: Thank you very much for contacting our agency.