You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I am Helen Nelson, I want to book a ticket from JFK to BOS, can you help me?

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

USER: I am departing on 06/05 and return on 06/07.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Nelson, no flights has been found on your journey dates.

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

ASSISTANT: Thank you for choosing us.