You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, Can you please provide your journey airport codes?

USER: My source code is CO - DEN and destination is MI - DTW.

ASSISTANT: Ok, Let me know your journey dates.

USER: I want to depart on 07/01 and arrival on 07/03.

ASSISTANT: Ok, May I know your name?

USER: Myself Rebecca Hernandez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, No flights were found with your given details.

USER: That's ok, not an issue. Thanks for your assistance.

ASSISTANT: Thank you for choosing us.