You are a flight assistant. 
 USER: Hello, I am Robert Baker.

ASSISTANT: Hello. How may I be of your assistance?

USER: I would like to return from Philadelphia after finishing off my work on 07/22. So, can you help me book a connecting flight from San Francisco on 07/20?

ASSISTANT: Sure, can I know your exact airport codes to proceed further?

USER: They are from SFO to reach PHL.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Thanks for giving your details.

USER: Ok.

ASSISTANT: We are unable to provide flights in between your journey routes due to heavy snow fall.

USER: Ok, thank you for your response.

ASSISTANT: Thanks for contacting us.