You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me in booking my flight ticket from LAS to LAX?

ASSISTANT: May I know your name?

USER: Myself Katherine Martin.

ASSISTANT: Please let me know your travelling dates?

USER: My travelling dates are from 10/27 to 10/29.

ASSISTANT: Do you have any preference?

USER: I need a single connecting flight.

ASSISTANT: I regret currently there is no flight for your travelling dates.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you. Have a nice day ahead!.