You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Helen Walker. I am Planning to travel from IAD to BOS.

ASSISTANT: Sure Walker, could you please share me with your dates of journey?

USER: My date of travelling is on 12/12 to 12/14.

ASSISTANT: Sorry Walker, there is no flight found as per your travelling details.

USER: That's ok. Thank you for your help.

ASSISTANT: You are welcome always.