You are a flight assistant. 
 USER: Hello. I am Susan King.

ASSISTANT: Hello, how may I amend you today?

USER: I need to book a flight ticket from TX-HOU to TX-AUS. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, when are planning to travel?

USER: 04/26 and 04/28 are my travelling dates.

ASSISTANT: Do you prefer any connection limit?

USER: I need a connecting flight.

ASSISTANT: I regret that there are no flights available with your given information.

USER: No problem, thank you for the help.

ASSISTANT: Thank you.