You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Elizabeth Adams.

ASSISTANT: How may I assist you ?

USER: I want to book a flight ticket to go for a holiday trip with my family.

ASSISTANT: May I know the travelling date ?

USER: My source point is from IAD on 01/01 and destination is to CLT on 01/03.

ASSISTANT: Please provide flight connection.

USER: Make sure the connection limit be 1 and price is 500.

ASSISTANT: I am sorry there is no flight at the moment.

USER: Ok, thank you for your service.

ASSISTANT: Thanks.