You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Harris.

ASSISTANT: How can I help you?

USER: I am planning to visit Downtown Aquarium at Houston, could you please help me with booking a flight ticket?

ASSISTANT: Sure, can you help me with your airport codes please?

USER: My nearest source airport code is AUS and destination airport code is HOU.

ASSISTANT: May I know your journey dates please?

USER: I would like to take off on 11/18 and return on 11/20.

ASSISTANT: Flight-1010 from Spirit airlines is there for you with travel charge of 100, shall I proceed booking?

USER: Please proceed with the booking if the connection is 1.

ASSISTANT: Your ticket has been booked, have a safe journey.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Thank you for choosing us.