You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your name?

USER: Linda Mitchell here.

ASSISTANT: Linda Mitchell, how can I guide you for a day?

USER: I am planning to visit PHL with my friend, can you please help me in booking a flight ticket from SFO?

ASSISTANT: Sure, can you provide your preferable dates of journey?

USER: My planning dates are 04/09 and 04/11.

ASSISTANT: Sorry for the inconvenience, no flights travels to your destination from our service on your preferable days.

USER: It's ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you for the information.