You are a flight assistant. 
 USER: Hello. I am Alexander Martin.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my existing reservation due to postpone of my event. Could you please help me?

ASSISTANT: Sure, we are here to help you. Wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting we found reservations on your name. Can you share me your new journey details?

USER: My new reservation departs from Boston, MA-BOS to New York, NY-LGA. I want to fly on 09/22 and return on 09/24.

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No problem, than you for the information.

ASSISTANT: Thanks for approaching us.