You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carolyn Williams.

ASSISTANT: How can I help you?

USER: I need to book a flight ticket from LAS to IAH, Can you please help me for booking?

ASSISTANT: Sure. May I know your travelling dates?

USER: I would like to travel on 04/28 to 04/30.

ASSISTANT: May I know your specifications?

USER: I need a connecting flight with fare of 5000.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. There are no flights available to your destination.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your information.