You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT:  Sure, may I know the travelling dates?

USER: I want to take off on 12 July and return on 14 July.

ASSISTANT: Do you have any connection limit?

USER: I want a connecting flight.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Ronald Hernandez.

ASSISTANT:  Sorry, no flights found with your chosen dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for opting us.