You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Robert Thomas. I am looking for a flight from IAH to AUS, can you help me?

ASSISTANT: Sure, may I know your journey dates?

USER: My travelling dates are 23 and 25 of Apr.

ASSISTANT: Do you have any specifications?

USER: My airline preference is normal cost and I need to return in the morning with a connecting flight.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.