You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a flight from DCA to PHL?

ASSISTANT: Sure, I will help you. May I know your name?

USER: Sarah Phillips here.

ASSISTANT: Thank you. May I know your travel dates?

USER: Sure, my travelling dates are on Aug 2nd to 4th.

ASSISTANT: Do you have any connection limit preference for this trip?

USER: Yes.

ASSISTANT: Are you looking for any other help from my side?

USER: No.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, thank you.

ASSISTANT: You are most welcome.