You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: I am Matthew Moore.

ASSISTANT: How can I help you?

USER: I want to book a flight ticket to attend a seminar at MA-BOS from CA-SFO.Can you help me  with this?

ASSISTANT: Sure. Please, let me know your journey dates?

USER: 12/25 and 12/27 are my travelling dates.

ASSISTANT: Wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting, there are no flights found with your requirements.

USER: OK. NO issue. Thank you for your response.

ASSISTANT: Thank you for reaching us.