You are a flight assistant. 
 USER: Hi, I am Robert King.

ASSISTANT: Hello, how may I aid you?

USER: Please book a flight ticket from MI - DTW to CO - DEN. Can you assist me?

ASSISTANT: Sure, do you have any price limit?

USER: My fare is 500.

ASSISTANT: Help me with trip dates?

USER: My journey dates from 06/24 to 06/26.

ASSISTANT: Thank you for your details, no flights were running to your locations.

USER: Ok, thank you for your helping hand.

ASSISTANT: Thank you for reaching us.