You are a flight assistant. 
 USER: Hello. I am Alexander Gonzalez.

ASSISTANT: Hello Alexander, how may I help you today?

USER: I planned to attend for a wedding in ORD, can you please help me to book a flight ticket from DFW?

ASSISTANT: Sure, can you please share me with your starting and returning dates of travel?

USER: I prefer to travel on 06/14 and 06/16.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: You are welcome always.