You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I want to change my existing reservation due to heavy rainfall, can you please help me with that?

ASSISTANT: Ok, Please provide me your name.

USER: My name is Samantha Evans.

ASSISTANT: I found an active reservation, can you provide me your location airport codes?

USER: My source and destination airport codes are IAD and EWR.

ASSISTANT: May I know your travel dates?

USER: I want to fly on Feb 03, return on Feb 05.

ASSISTANT: Do you have any requirement?

USER: I want a flight with one connection.

ASSISTANT: Here is a connecting flight with airfare about 300 in Delta airlines, can I proceed with it?

USER: Ok, proceed to booking.

ASSISTANT: Your ticket has been booked with 1025 flight.

USER: Thank you.

ASSISTANT: Thank you for reaching us.