You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Denni Wilson. Can you please book me a ticket with the fare of 200?

ASSISTANT: Sure, to book a ticket may I know when you are willing to travel?

USER: I would like to leave between 08/05 and 08/07.

ASSISTANT: Can you please share me your source and destination codes?

USER: My airport codes are from DCA to DTW.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Unfortunately, there is no flights found with your given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.