You are a flight assistant. 
 USER: Hello. Justin Martinez here.

ASSISTANT: Hello, how may I assist you today?

USER: I want to go to The Desert Botanical Garden in Phoenix - PHL, can you please help me to book a flight ticket from Washington - DCA?

ASSISTANT: Sure, may I know on which dates you are planning to make your journey?

USER: I will takeoff on Mar 14th and return back on Mar 16th.

ASSISTANT: May I know at what price you are looking for airfare?

USER: I can pay up to 5000.

ASSISTANT: Sorry we did not find any flights matching your credentials.

USER: No problem, thank you for your time.

ASSISTANT: Thank you opting us.