You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Sarah Thomas, need to book a ticket to LGA to DCA. Can you please help me in booking?

ASSISTANT: Ok, may I know your travel dates?

USER: My travel dates are from 01/11 to 01/13.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight. Price limit is 5000.

ASSISTANT: Sorry to inform you that no direct flights are available on your travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT:  Thank you for availing us.