You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: My name is Benjamin Campbell. I would like to visit Philadelphia to meet my uncle, please book a ticket from JFK to PHL.

ASSISTANT: May I know your trip dates?

USER: My trip dates are 08/10 and 08/12.

ASSISTANT: There is no flight available.

USER: Ok, thank you for your information.

ASSISTANT: Most wwelcome.