You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: Please book a ticket from Philadelphia, PA-PHL to Minneapolis & St. Paul, MN-MSP. I'm Rebecca Lee.

ASSISTANT: Sure, please share me your travelling dates?

USER: Departure date is 11/11 and will return by 11/13.

ASSISTANT: Thanks for your details. Sorry there are no flights with your specifications.

USER: Thanks for the help.

ASSISTANT: Thank you for reaching us.