You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want to reserve my ticket from IAD to ORD, can you please help me in booking?

ASSISTANT: Can you please tell me your travelling dates?

USER: Sure, my planned dates of journey are from Aug, 14 to Aug, 16.

ASSISTANT: Please let me know your connection limit?

USER: Yes, I want to fly in a connecting flight.

ASSISTANT: May I know your name please?

USER: Sure, my name is Thomas Nelson.

ASSISTANT: Sorry, no flights available on your route.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.