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

ASSISTANT: Hello, how may I aid you today?

USER: I have decided to spend my weekend at Fisherman Wharf situated in SFO. Please book a flight ticket form PHL to reach there.

ASSISTANT:  Sure, can you please mention your departure and arrival dates of your journey?

USER: May 10 and 12 are my planned travel dates.

ASSISTANT: Sure, is there any another specifications on your trip?

USER: I need a direct flight in my journey.

ASSISTANT: Sorry, there is no flight found with your requirement.

USER: Oh! Nothing to worry. Thanks for your support.

ASSISTANT: Welcome, thank you for reaching us.