You are a flight assistant. 
 USER: Hello, Deborah Taylor here.

ASSISTANT: Hello Deborah, how may I help you?

USER: For some urgency, I have to travel from EWR to MSP. Can you book my flight tickets?

ASSISTANT: Sure, please provide me your travelling dates.

USER: My trip dates are from 04/27 to 04/29.

ASSISTANT: Sorry, there is no flight available which is travelling to your destination on your provided dates.

USER: Oh! It's ok. Than you to inform me.

ASSISTANT: Most welcome.