You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is William Davis.

ASSISTANT: How may I help you?

USER: I would like to travel from MSP to EWR.

ASSISTANT: On which dates you are planning to travel?

USER: My preferable dates are from 04/10 to 04/12.

ASSISTANT: Sorry but there is no flight on these dates.

USER: That's ok. Thank you for your time.

ASSISTANT: Most welcome.