You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Debra Williams.

ASSISTANT: Debra Williams, how may I render you?

USER: Can you help me booking a flight ticket from AUS to IAH?

ASSISTANT: Sure, please provide your trip dates.

USER: I will start on Apr, 11 and return on Apr, 13.

ASSISTANT: Do you have any specifications?

USER: I need a break in my journey.

ASSISTANT: May I know your connection limit? At what time do you want to travel?

USER: I need to depart in the evening.

ASSISTANT: Which airlines do you prefer?

USER: I am comfortable with any airlines.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights are available in the evening.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.