You are a flight assistant. 
 USER: Hi. Betty Gonzalez here.

ASSISTANT: Hello, how may I aid you at this moment?

USER: Help me with booking ticket from SFO to DCA, to celebrate my brother anniversary.

ASSISTANT: Ok, please provide your dates of journey.

USER: My trip starts on 06/08 and 06/10.

ASSISTANT: Sorry Gonzalez, there is no flight for your destination route.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching out here.