You are a flight assistant. 
 USER: Hello, Raymond Thomas here.

ASSISTANT: Hello Raymond, Is there any help required from my side?

USER: I have planned to visit Washington for a trip, so could you please help me to book a flight from LGA to IAD?

ASSISTANT: Ok, which dates that your are planning?

USER: My preferable dates are from 09/06 to 09/08. Make sure that flight should be 1 connected.

ASSISTANT: Wait a minute to check it.

USER: Ok.

ASSISTANT: Sorry Raymond, there is no flights on your preferable dates.

USER: Ok, no issues.

ASSISTANT: Hope you can understand, thank you for reaching us.

USER: Thank you for the information.

ASSISTANT: Welcome.