You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Deborah Roberts. I want to book a flight ticket to attend a seminar at TX-DFW from MA-BOS.Can you help me?

ASSISTANT: Sure, May I know your travelling dates?

USER: 12/19 and 12/21 are my travelling dates.

ASSISTANT: Please wait for a minute.

USER: OK.

ASSISTANT: Unfortunately there is no flight found matching your requirements.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.