You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Jacob Harris. I am planning to go for Denver DEN, can you please search a flight ticket from Charlotte CLT?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I need my flight ticket on July 11 and July 13 dates.

ASSISTANT: Do you have any airline preferences?

USER: No, I do not have any airline preference.

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

USER: Ok, fine than you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.