You are a flight assistant. 
 USER: Hi. I am Samuel Harris.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket from NC-CLT to TX-IAH. Can you help me?

ASSISTANT: Sure, can you please provide your dates of travel?

USER: 03/19 and 03/21 are my travelling dates.

ASSISTANT: Is there any class preference?

USER: No, I am comfortable with any flight.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for opting us.