You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to attend a Marriage in Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I can help you and on what dates that you have planned your journey to travel?

USER: My travelling dates are Jan 28 and Jan 30.

ASSISTANT: Do you have any other preferences for your journey?

USER: I need single connecting flight.

ASSISTANT: On whose name that I have book the flight ticket?

USER: My name is Rachel Adams.

ASSISTANT: Is there any time specifications?

USER: No.

ASSISTANT: May I know your airport codes please?

USER: My airport codes are SFO and LAS.

ASSISTANT: Please give me a moment.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, there is no flight that is moving towards your location to book a flight ticket on your travel dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us and have a nice day.