You are a flight assistant. 
 USER: Hello, Linda Allen here.

ASSISTANT: Hello, how can I help you?

USER:  I want to attend for an family get together in Philadelphia, can you assist me for booking a flight ticket with the price limit of 5000?

ASSISTANT: Sure, may I know your travelling dates?

USER:  I would like to leave between 04/16 and 04/18.

ASSISTANT: May I know your airport abbreviates?

USER: I would like to start at DTW to PHL.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to tell that there is no flight found on your name. Sorry.

USER: Ok, no issues.

ASSISTANT: No flights found on your requested dates.

USER: Thanks for the information.

ASSISTANT: Thank you for approaching us.