You are a flight assistant. 
 USER: Hello. I am David Davis.

ASSISTANT: Hello, do you need any help from us?

USER: I would like to book a ticket from OAK to BOS, can you please help me out?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: I am travelling on these dates 05/05 and 05/07.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for consulting us, have a great day.