You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help for the day?

USER: I need to change my reservation as my event got postponed. Can you help me?

ASSISTANT: Sure, please share your good name?

USER: I am Sarah Wright.

ASSISTANT: We found a reservation on your name and please share your travelling dates.

USER: I would start on Feb 10th and comeback on Feb 12th.

ASSISTANT: Can I know your airport codes?

USER: My origin is EWR and destination is LGA.

ASSISTANT: Do you prefer a connecting flight?

USER: Yes, I need 1 stop over.

ASSISTANT: Do you have any other specifications, like airline and class?

USER: No.

ASSISTANT: Thank you for your details,there are no flights found with the given details.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you.