You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Do you have any flight from IAD to SFO?

ASSISTANT: Ok, can I have your trip dates?

USER: My trip dates are 07/31 and 08/02.

ASSISTANT: There is no flight on your route to book your ticket.

USER: It's ok, no issues.

ASSISTANT: May I know your name for the documentation purpose?

USER: Frank Adams here.

ASSISTANT: Thanks for contacting us.

USER: Welcome.