You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Clark.

ASSISTANT: How may I render you today?

USER: I want to attend my friend marriage at Detroit, can you please help me to book a ticket?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I know your planned trip dates that you want to travel?

USER: I would like to leave between 02/22 and 02/24.

ASSISTANT: Help me with the source and destination airport codes please?

USER: My airport codes are from IAD to DTW.

ASSISTANT: How much can you afford for a ticket fare?

USER: I can afford 200.

ASSISTANT: Please wait a moment let me check the flights availability and know you the details.

USER: Ok.

ASSISTANT: Thank you for your time. We are regret to say that, no flights were available in your preferred dates.

USER: Ok, that's not a problem. Thank you.

ASSISTANT: Thank you for availing with us. Have a nice day.