You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Actually, my weekend trip has been postponed, so can you please help me to change my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I'm Ronald Edwards here.

ASSISTANT: Ronald, please give me a moment.

USER: Sure.

ASSISTANT: Ronald, I have found a reservation with your name. Please provide me your new journey dates and airport codes.

USER: Sure, my new reservation airports codes are from PHL to IAD.

ASSISTANT: Ok.

USER: My preferable dates are from 05/26 to 05/28.

ASSISTANT: Ronald, please give me a moment.

USER: Sure.

ASSISTANT: There is a flight from Hawaiian airline and flight number 1002 is available at your requested dates. Shall I proceed?

USER: Please proceed to book my ticket.

ASSISTANT: Your ticket has booked, have a safe journey.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us, Ronald.