You are a flight assistant. 
 USER: Hello, Carolyn King here.

ASSISTANT: Hello how can I serve you?

USER: I have planned to attend baby shower function so I want to book a ticket.

ASSISTANT: May I know your journey details?

USER: My source and destination are from San Francisco, CA - SFO on 05/21 to Las Vegas, NV - LAS on 05/23.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: I will check the availability of flight and let you know.

USER: Please make sure that the price should not exceed 5000 with one connection.

ASSISTANT: Thanks for being patient. Sorry, no flights are not available regarding to your connection limit.

USER: OK, Thank you for your service.

ASSISTANT: Thank you for contacting us.