You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you help me to book a flight ticket from LAS to LAX?

ASSISTANT: Sure, May I know the travelling dates?

USER: Ok, please can I know your dates of journey Oct 20 and Oct 22?

ASSISTANT: Do you have any connection limit?

USER: Ok, please book a connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Gary Green.

ASSISTANT: Please wait a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for availing us.