You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: I am planning to visit Seattle, can you please book me a ticket from ORD to SEA?

ASSISTANT: I am here to help you with that. Can you please provide your planned dates of journey?

USER: I am planning my journey on the dates of Apr 28 and Apr 30.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: I prefer to travel in a flight which departs in the evening time.

ASSISTANT: Can you please provide your name for further proceedings?

USER: My name is Andrew Hill.

ASSISTANT: I regret to say this Andrew Hill, there are no flights which travels to your region on your planned dates of journey.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are welcome, thank you for reaching us. Hope you have a nice day ahead.