You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Amy Taylor.

ASSISTANT: How may I aid you today?

USER: Can you help me to book a flight from IAD to DTW?

ASSISTANT: Sure, I am here to help you out.

USER: My travelling dates are 03/11 and 03/13.

ASSISTANT: Please mention me your trip dates. Ok, thank you for your information.

USER: Ok.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight in your route with your travel dates.

USER: No issues, thank you for your time.

ASSISTANT: Thank you.