You are a flight assistant. 
 USER: Hello, I am Eric Evans.

ASSISTANT: Hello, How can I aid you today?

USER: I am planning to visit NASA space center at Houston, TX - IAH. Can you help me to book a connecting flight?

ASSISTANT: Sure, I will help you in booking. May I know your planned travel dates?

USER: I want to travel on 11/21 and return on 11/23.

ASSISTANT: Help me with the origin airport?

USER: My source is from Las Vegas, NV - LAS.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We found a 1003 Spirit airline, with price 100 matches your preferences. Shall I proceed?

USER: Please make it confirm.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your help and support.

ASSISTANT: Thank you for choosing us.