You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Johnson.

ASSISTANT: How may I aid you today?

USER: I want to attend transportation festival at Phoenix, PHX. Can you help me in booking with a connecting flight?

ASSISTANT: Sure, I will help you. Can I have your trip dates?

USER: My travelling dates are from 08/21 to 08/23.

ASSISTANT: Help me with the source code?

USER: My source code is Houston, HOU.

ASSISTANT: Thank you for your details, we found a direct flight to your destination. Shall I proceed to book?

USER: Do not proceed. Thanks for the information.

ASSISTANT: Thank you for reaching us.