You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Can you help me to book a flight from IAD to BOS?

ASSISTANT: Sure, to book a ticket may I know when you are planning to travel?

USER: My planned dates are Aug 05 and 07.

ASSISTANT: Do you need any other requirements?

USER: I want to fly in a connecting flight.

ASSISTANT: Can you please share me your name?

USER: Sure, I am Helen Roberts.

ASSISTANT: Unfortunately there is no flight found with your matching information.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for choosing us.