You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to attend for a seminar in University of Texas in Austin, AUS. Can you avail me to book a connecting flight?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are Dec 20 and 22.

ASSISTANT: Please provide your source airport code.

USER: I want to board from Houston, HOU.

ASSISTANT: Do you have any specifications?

USER: Yes, I prefer normal cost airline to travel.

ASSISTANT: Do you have any other preferences?

USER: I want to catch my return flight in the afternoon time.

ASSISTANT: Please provide your name.

USER: Sure, Christopher Smith here.

ASSISTANT: There are no flights found under your preferable details.

USER: Ok, no issues. Thank you.

ASSISTANT: Welcome, have a great day.