You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan Harris.

ASSISTANT: How may I assist you for today?

USER: I would like to attend a seminar at Boston, can you help me to book a flight ticket from DFW to BOS?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: I am travelling from June 06 to June 08.

ASSISTANT: Give me a moment.

USER: Sure, please ensure the book a depart flight ticket at evening time.

ASSISTANT: Sorry to say that there are no flights found on your requested criteria.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.