You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I need you to book a flight ticket form LAS to IAH. Please help me with it.

ASSISTANT: Sure, May I know the travelling dates?

USER: February 4 and 6 are my planned travelling dates.

ASSISTANT: Do you have any connection limit?

USER: I need a break in my journey.

ASSISTANT: Is there any other requirements?

USER: I need to return in the evening.

ASSISTANT: May I know your name?

USER: My name is Christopher Moore.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you for availing us.