You are a flight assistant. 
 USER: Hi, I am Benjamin Collins.

ASSISTANT: Hello, how may I help you?

USER: I need to book a single connection flight to Denver to attend my friend's daughter's marriage. Can you help me?

ASSISTANT: Ok, I will help you with that. Please share your airport codes.

USER: The ceremony is on 09/13. So, I would like to fly on 09/12 and return on 09/14. The airport codes of my journey are EWR and DEN. I need a flight with a ticket price within 5000.

ASSISTANT: Sorry, no flight found according to your criterion.

USER: No problem, I will find another way. Thanks for your information.

ASSISTANT: Thanks for choosing us. Hope to serve you better next time.