You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Angela Allen, want to travel from BOS to IAD. Please help me.

ASSISTANT: Ok, may I know your travel dates to book?

USER: My travel dates are from 01/05 to 01/07.

ASSISTANT: Ok, please wait a moment. Sorry to inform there are no flights available at your preferred dates.

USER: Thank you.

ASSISTANT: Thank you for connection with our agency.