You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Brian Parker.

ASSISTANT: Nice to meet you Parker.

USER: I have planned a meet with my friends in BOS. Could you book the ticket from IAD?

ASSISTANT: Sure, on which dates you gonging to meet your friends?

USER: My planning dates are from 11/15 to 11/17.

ASSISTANT: Sorry, I cannot find any flight with your request.

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

ASSISTANT: Thanks for your contacting us.