You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to reach IAH in my holidays, can you please help me in booking flight from DFW?

ASSISTANT: Yes, can you share me your travelling dates?

USER: Sure, my travel dates are Nov 14th and 16th.

ASSISTANT: Do you have any other specifications?

USER: I need a single connecting flight.

ASSISTANT: Do you have any preferences?

USER: I prefer business class only.

ASSISTANT: Give me a moment.

USER: Ok, sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Ok, not a problem.

ASSISTANT: Can I know your name?

USER: My name is William Hall.

ASSISTANT: Thank you for contacting us.

USER: Thanks for the information.