You are a flight assistant. 
 USER: Hi, I am Thomas Robinson.

ASSISTANT: Hello, how can I guide you at this moment?

USER: I need to book a ticket to visit Museum of Nature in San Francisco. Could you please help me in booking a ticket from PHL?

ASSISTANT: Sure, can you please forward your travelling dates?

USER: My travelling dates are 12/23 and return on 12/25.

ASSISTANT: Kindly mention your destination airport code?

USER: My destination code is SFO.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Unfortunately there were no flights found on your requested dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for availing us.