You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Elizabeth Baker here. I would like to book a ticket from BOS to CLT, can you please help me with that?

ASSISTANT: Ok, may I know your travelling dates please?

USER: The travel dates are from 06/07 to 06/09.

ASSISTANT: Sorry to inform you, there are no flights available for you.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for contacting with our agency.