You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: My name is Sandra Evans. Can you please help me in booking the flight ticket from OAK to BOS?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travel dates are 08/13 and 08/15.

ASSISTANT: Do you have any other requirements?

USER: My depart time should be in the evening.

ASSISTANT: Ok, wait a minute.

USER: Take your time.

ASSISTANT: Sorry, currently there are no flights available on your requirements.

USER: OK, thank you for the information.

ASSISTANT: Thank you for reaching us.