You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Anthony Gonzalez here. I want to book a flight from CLT - DFW, can you help me?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates will be from 07/23 to 07/25.

ASSISTANT: Sorry, I did not flight any flight ticket with your preferable dates.

USER: Ok, that's fine. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.