You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I would like to travel to LAS for business trip, can you please reserve a flight ticket from OAK?

ASSISTANT: Sure, please share your planned travel dates?

USER: Sure, my planned travelling dates are Mar, 28 and 30 respectively.

ASSISTANT: Do you have any connection limit?

USER: Yes, flight has to be with single connection.

ASSISTANT: Any other preferences?

USER: Yes, I would like to return at evening.

ASSISTANT: Can I have your name please?

USER: Sure, my name is Angela Lopez.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for opting us.