You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Shirley Martinez here. Can you please reserve me a flight ticket from MSP to LAS?

ASSISTANT: May I know your desired travel dates please?

USER: My trip dates are 04/26- 04/28.

ASSISTANT: Do you have any other preferences?

USER: I need a single connection.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.