You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you today?

USER: I am Stephen Nelson.

ASSISTANT: Ok.

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

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I will start on 09/29 and return on 10/01.

ASSISTANT: In which class would you like me to book your flight ticket?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other requirements?

USER: I need to start in the evening time.

ASSISTANT:  Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.