You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I aid you?

USER: Please, reserve me a flight ticket to visit NASA Space Center at Houston, TX-IAH.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are 12/04 and 12/06.

ASSISTANT: May I know your source code?

USER: My source code is AZ-PHX.

ASSISTANT: May I know your name?

USER: Melissa Johnson here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we found an Frontier airline matching your essential details with single connection and the fare 500. Shall I proceed with booking?

USER: Do not proceed. Thanks for your kind information.

ASSISTANT: Sure, thank you for approaching us.