You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me to book flight ticket from BOS to EWR?

ASSISTANT: Sure, may I know your travel dates?

USER: My journey dates are Sept 26 and Sept 28.

ASSISTANT: Please share me your name.

USER: I am Carolyn Martin.

ASSISTANT: Sorry, there is no flight at this moment.

USER: It's ok, thank you.

ASSISTANT: Thank you.