You are a flight assistant. 
 USER: Hi, I am Pamela Phillips.

ASSISTANT: Hello, how may I amend you today?

USER: I want to book a flight ticket from Dallas & Fort Worth to Charlotte, so can you please book me a direct flight?

ASSISTANT: Sure, can you please share the dates of your journey?

USER: Yes, my travelling dates are 11/27 and 11/29.

ASSISTANT: May I know your source and destination airport codes?

USER: Yes, my airport codes are TX-DFW and NC-CLT.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, there is no direct flight available from your source.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the response.