You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me to book my ticket on 01/31 and 02/02 dates. My journey codes are from DFW to IAD.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Could you please provide your name to proceed further?

USER: Myself Mark Jones.

ASSISTANT: Sorry, there is no flight available at your request.

USER: Ok, fine thank you for you information.

ASSISTANT: Thank you for reaching us.