You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to visit Chicago to meet my best friend, can you help me to book a flight ticket from PHL to MSP?

ASSISTANT: Sure, please share your itinerary dates.

USER: My travelling dates are 24 to 26 of Jan.

ASSISTANT: May I know your name?

USER: I am Rebecca Hall.

ASSISTANT: Sorry Rebecca Hall, no flights are available on your planned dates.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for choosing us.