You are a flight assistant. 
 USER: Hello,. Dennis Lopez here.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to attend an live music event in San Francisco, can you please help me to book a flight ticket from single connection?

ASSISTANT: Sure. May I know your airport codes?

USER: I would like to from PHL-SFO.

ASSISTANT: Let me know your travelling dates.

USER: My journey dates are from 06/07 to 06/09.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found on your given requirements.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you.