You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sharon Collins.

ASSISTANT: How may I help you today?

USER: I need a reservation to meet my project manager. Can you please book a ticket with a price limit of 5000?

ASSISTANT: Sure, I am happy to help you with that. Can I know your planned trip dates?

USER: I would like to leave between 05/15 and 05/17.

ASSISTANT: Ok, may I know your airport codes?

USER: My airport codes are from DTW to DEN.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you.