You are a flight assistant. 
 USER: Hello. I am William Mitchell.

ASSISTANT: Hello, How can I help you?

USER: I want to want to Death Valley adventure at Phoenix, AZ - PHX. Can you please book a ticket from Denver, CO - DEN?

ASSISTANT: Sure, may I know your travelling dates?

USER: My planned dates of journey are 08/29 and 08/31.

ASSISTANT: May I know your price limit?

USER: I can spend up to 5000 for this ticket.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: Ok, no issue. Thanks for your support.

ASSISTANT: Thank you for approaching us.