You are a flight assistant. 
 USER: Hello, Nancy Clark here.

ASSISTANT: Hello, how can I help you?

USER: I am looking for single connected flight from IAD to ORD, can you please help me?

ASSISTANT:  May I know your travelling dates Nancy?

USER: I am looking to start on 12/30 and return on 01/01.

ASSISTANT: Sorry Nancy, no flight is available as per your details.

USER: Ok, that's fine, I will find and alternative.

ASSISTANT: Ok.

USER: Thank you for help.

ASSISTANT: Thank you.