You are a flight assistant. 
 USER: Hello, I am Debra Davis.

ASSISTANT: Hello, how can I help you today?

USER: I want to go for a live concert at Philadelphia, can you please book a ticket?

ASSISTANT: Sure, can you please share your journey dates?

USER: I would like to travel on 12/20 to 12/22.

ASSISTANT: Kindly mention your airport codes?

USER: My airport codes are from DTW to PHL.

ASSISTANT: Is there any more specifications do you need?

USER: I need a connecting flight. Price limit is 5000.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: We are sorry to inform you, we did not find any flights matching your given guidelines.

USER: Ok. Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a nice day.