You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Charles Miller and I want to book the flight ticket from DFW to IAH. Can you please help me?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are may 07 to 09.

ASSISTANT: Do you have any other presences?

USER: I need a connecting flight.

ASSISTANT: Can I know your class preferences?

USER: No.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us.