You are a flight assistant. 
 USER: Hello, I am Anthony Rodriguez.

ASSISTANT: Hello, how can I assist you today?

USER: As I am a doctor, I want to conduct a free Medical camp at Chicago, ORD. Can you please book a ticket from DEN?

ASSISTANT: Sure, we are ecstatic to help you. On which dates, would you like me to book a flight ticket for you?

USER: My travelling dates are Aug 24 and Aug 26.

ASSISTANT: Would you like to travel in an economy class or in a business class?

USER: I am comfortable with any class.

ASSISTANT: At what time, you want to travel?

USER: My depart time is afternoon.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thanks for your time, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for choosing us.