You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Could you help me out in booking a ticket?

ASSISTANT: Sure, can you please provide the travelling details?

USER: Myself Patricia Nelson. My codes are from CLT to DFW, and dates are from 04/12 till 04/15.

ASSISTANT: Ok, please give me a second.

USER: Ok.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: It's ok.

ASSISTANT: Ok, thank you for reaching us.

USER: Thank you.