You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Timothy Walker, want to travel from JFK to IAD. Please help me in booking my ticket.

ASSISTANT: Sure, let me know your travelling dates.

USER: Sure, my travelling dates are from 05/20 to 05/22.

ASSISTANT: Please share your connection limit.

USER: I can go with any of the connections.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a business class.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.