You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Catherine Thompson here.

ASSISTANT: How may I aid you today?

USER: Can you book a flight ticket for my airport codes that is from HOU to AUS?

ASSISTANT: Sure, I will help you with your request. Can you please provide your preferable travelling dates?

USER: The travel dates are from 19 June to 21 June.

ASSISTANT: Do you have any class preference?

USER: That does not matter. But I need a normal-cost airline.

ASSISTANT: Is there any specific timings in your departure and arrival?

USER: The return time would be morning.

ASSISTANT: Any connection limit do you have?

USER: I need a single connecting flight.

ASSISTANT: Please be on hold to check the flights.

USER: Sure.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for approaching us, have a great day.