You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: Sandra Hall.

ASSISTANT: Sandra Hall, how can I help you?

USER: I want to book a ticket from NV - LAS to TX - IAH.

ASSISTANT: Sure, can you provide your travelling dates?

USER: My travelling dates are 12/05 and 12/07. price limit is 5000 with single connection.

ASSISTANT: Please wait a moment, I will check the availability and get you back.

USER: Sure.

ASSISTANT: Thanks for waiting, I am extremely sorry to inform that no flights are available based on your specifications.

USER: No issue, thank you.

ASSISTANT: Have a great day.