You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at present?

USER: Please help me to change my active reservation as my meeting was postponed.

ASSISTANT: Sure, Let me know your name to check with your reservation.

USER: Myself Mary Harris.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Ok.

ASSISTANT: We are happy to notify you that, we found a reservation on your name . Can you please share your travelling airport codes?

USER: I will fly from OAK to JFK.

ASSISTANT: Ok, May I know your scheduled dates?

USER: I have planned to travel on Apr 22nd and return on Apr 24th.

ASSISTANT: How many connections are you required?

USER: One connection limit.

ASSISTANT: Ok, Please share your class preference.

USER: I am ok with any class.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: We found a flight in 1014 United Airline with a fare of 100 in economy class which matches to your details. Can I proceed for booking?

USER: Is this flight depart at afternoon time. Sorry, I want to depart at morning time.

ASSISTANT: Yes, morning is your depart time.

USER: Ok, please book it.

ASSISTANT: Sure, your ticket has been successfully changed.

USER: Thank you.

ASSISTANT: Thank you for reaching our service.