You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Carolyn Smith.

ASSISTANT: How can I help you?

USER: I am planning to visit New England Aquarium in BOS with my family.

ASSISTANT: May I know the dates of journey?

USER: Can you book a ticket from SFO? My travel dates are from 12/22 to 12/24.

ASSISTANT: Sorry, there is no flight found.

USER: It's fine. Thank you for your help.

ASSISTANT: Welcome.