You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Sandra Miller. I want to book a ticket from LGA to MSO to meet parents.

ASSISTANT: Ok, may I know your travelling dates?

USER: I am departing on 01/05 and return on 01/07.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no flight on your requested dates.

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

ASSISTANT: Thank you for choosing us.