You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Richard Lewis. I want to book a ticket from MSP to JFK to meet my grandparents.

ASSISTANT: Sure, may I know your planned dates?

USER: My travel dates are 01/16 and return on 01/18.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: I feel gloomy to say this, there is no flight on your preferable dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for opting us.