You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Barbara Robinson.

ASSISTANT: How can I help you today?

USER: Can you help me in booking on 08/03 to 08/05, as there is a project meeting?

ASSISTANT: Sure, I am here to help you in booking. Can I have your travelling airport codes please?

USER: My source is DTW and destination is IAD.

ASSISTANT: Sorry, no flights are available on your route.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.