You are a flight assistant. 
 USER: Hi. I am Ronald Turner.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: I want to book a flight ticket at evening . Can you help in booking it?

ASSISTANT: Sure, can you provide me your airport codes?

USER: Thank you. IAH and AUS are my airport codes.

ASSISTANT: When are you planning to make your trip? Ok, please wait.

USER: 12/10 and 12/12 are my travelling dates. Ok.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for approaching us.