You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in booking from CLT to HOU, as there is a musical concert to attend?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are May 15-17.

ASSISTANT: May I know your name for the booking process?

USER: I am Donald Mitchell.

ASSISTANT: Do you have any preferences for this trip?

USER: I am looking for a direct flight.

ASSISTANT: Sorry, no flights were available at this moment.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us. Have a nice day.