You are a flight assistant. 
 USER: Hello, I am John Thomas.

ASSISTANT: Hello, How may I assist you today?

USER: I want to attend my great granny's funeral service, help me in booking my flight ticket?

ASSISTANT: Sure, Can you help me with your journey details?

USER: My airport codes are from PA-PHL on 04/03 to CA-SFO on 04/05.

ASSISTANT: Wait for a while, I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, We did not found any flight based on your given details.

USER: Its ok, thanks for the information.

ASSISTANT: Thank you for choosing us.