You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you book a flight ticket from IAH to CLT. Can you find a flight ticket for me?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: Ok, my planned trip dates are on may 01 and return on May 03.

ASSISTANT: Do you have any connection limit?

USER: Ok, I need a single connecting flight.

ASSISTANT: Is there any other specifications?

USER: I want an economy class.

ASSISTANT: May I know your name?

USER:  Ok, I am John Perez.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.