You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: Can you help me to book a flight ticket from IAH to PHX?

ASSISTANT: Sure, could I have your journey dates, please?

USER: I want to take off on 18 Nov and return on 20 Nov.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Are there any more specifications?

USER: Sorry, I need a direct flight.

ASSISTANT: Ok, on what name, do I need to reserve the ticket?

USER: I am Melissa King.

ASSISTANT: We found a direct flight 1024 from United airlines has fare 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thank you for helping me.

ASSISTANT: Thank you for availing us.