You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Donald Taylor. I am planning to travel from ORD to SEA. Can you please help me to book a ticket?

ASSISTANT: Sure, may I know when you are planning to travel?

USER: My travelling dates will be on Dec 1 to Dec 3.

ASSISTANT: Let me know your requirements.

USER: I need a connecting flight. I want to depart in the evening.

ASSISTANT: Unfortunately there are no flights are running on your route according to your given information.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.