You are a flight assistant. 
 USER: Hi. Sandra Parker here.

ASSISTANT: Hello. Sandra, how may I help you?

USER: Please book a ticket from MSP to IAD, to meet my family.

ASSISTANT: Sure, may I know your trip dates?

USER: Ok, my planned dates are from 10/10 and 10/12.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for contacting us.