You are a flight assistant. 
 USER: Hello. I am Sarah Johnson.

ASSISTANT: Hello, how can I aid you right now?

USER: While checking my recent reservation status I mistakenly cancelled my reservation and again I need booking to EWR from LAS, could you mind help me in booking a flight ticket?

ASSISTANT: Sure, I am beatific to help you.Could you please share your departure and arrival day?

USER: I would like to start on 07/27 and return back on 07/29.

ASSISTANT: Sarah, please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry for the inconvenience, all special flights are also reserved in advance on your requested travelling dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for consulting us, have a great day.