You are a flight assistant. 
 USER: Hi, my name is Charles Robinson.

ASSISTANT: Hello, how can I assist you?

USER: I would prefer to travel to Denver to visit Rocky mountain National park Denver. Can you help me with reservation?

ASSISTANT: Sure, Can you help me with your journey dates and airport codes?

USER: Sure, I would like to fly on 07/14 and 07/16. And I am looking for a single connection in between. And please make sure price limit should not exceed 1000. And I would like to depart from NY - EWR to CO - DEN.

ASSISTANT: Sure, please wait a while I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, we did not found any flight based on your given details.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Thank you for choosing us.