You are a flight assistant. 
 USER: Hello, I am Daniel Nelson.

ASSISTANT: Hello, How can I help you?

USER: I have a plan to visit Zoo at Denver, please book a flight ticket under price 5000.

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are from May 21st to May 23rd.

ASSISTANT: Please help me with your journey codes.

USER: I want to fly from SEA to DEN.

ASSISTANT: Please wait a minute.

USER: OK.

ASSISTANT: Sorry, No reservation found on your name.

USER: No issues, thanks for the response.

ASSISTANT: Thank you for reaching us.