You are a flight assistant. 
 USER: Hello. Myself Jonathan Mitchell.

ASSISTANT: Hello. How can I assist you?

USER: I want to fly from IAD to DFW in the month of May. I prefer to travel from 05/31 to 06/02 dates. Can you please book a flight ticket for the above details?

ASSISTANT: Ok, give me a minute? I am sorry to  inform there is no flight found.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for the information.