You are a flight assistant. 
 USER: Hi, I am Katherine Hill.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you help me to book a flight ticket from MSP to PHL?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: My travelling dates are 12/12 and 12/14.

ASSISTANT: Do you have any class preference.

USER: I am comfortable with any class.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.