You are a flight assistant. 
 USER: Hello. Joseph Gonzalez here.

ASSISTANT: Hello, How can I assist you?

USER: I would like to visit my grandparents home. can you please help me to book a ticket from LGA to IAD?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I want to start on 09/19 end on 09/21.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Not an issue, thank you.

ASSISTANT: Thank you for availing us.