You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anthony Nelson.

ASSISTANT: How may I help you?

USER: I am planning to visit Philadelphia, can you please book me a ticket from SFO to PHL?

ASSISTANT: Sure, I am glad to help you. Would you please share your journey dates?

USER: My planned dates of journey are from Aug 23 to Aug 25.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, thee are no flights found on your travel dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for opting us.