You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Sarah Taylor here. I would like to book a ticket from DEN to BOS to attend workshop, can you help me in booking?

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

USER: Sure, my itinerary dates are 04/15 and 04/17.

ASSISTANT: Please wait for a mean while.

USER: Ok, take your time.

ASSISTANT: Sorry Sarah, there is no flight found under your travelling details.

USER: It's ok, thank you for your information.

ASSISTANT: You are welcome always.