You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Garcia.

ASSISTANT: How may I lend a hand to?

USER: I need a flight to write an exam in New York university, can you please help me in flight ticket booking from DCA to LGA?

ASSISTANT: Helen, I am here to help you. When you are willing to travel?

USER: Thank you and the exam is on 10/16. So, I would like to move one day prior on 10/15 and return back on 10/17 after my exam.

ASSISTANT: Please wait for a while.

USER: Sure, take your own time and provide me an enhanced flight for my journey.

ASSISTANT: Helen sorry to intimate, no flights are available with your requirements.

USER: That's fine. I can prefer any other source to reach my location. Thank you for your help.

ASSISTANT: Thank you Helen for approaching us.