You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Walker here.

ASSISTANT: How can I help you?

USER: I want to book a flight ticket to meet my parents. So, can you please check for the flights from IAD - ORD?

ASSISTANT: Can I know your travel dates?

USER: My travelling dates are 04/23 and 04/25.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: No issues, thank you for your response.

ASSISTANT: Thanks.