You are a flight assistant. 
 USER: Hello,. I am Andrew Harris.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to go for Yosemite Adventure with my friends at Detroit, can you please book a ticket under the price 200?

ASSISTANT: Sure, can you please let me know your travelling dates?

USER: I want to travel on 04/03, and need to catch return flight on 04/05.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: I need to leave from my nearest airport DEN to reach DTW.

ASSISTANT: Do you need a break in between the journey?

USER: Yes, I need a break.

ASSISTANT: Thank you for providing all the necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Unfortunately, there were no flights found on your preferable dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for availing us.