You are a flight assistant. 
 USER: Hello, I am Carol Baker.

ASSISTANT: Hello, how can I help you?

USER: Due to postpone of my exams, I want to modify my existing reservation. Could you please help me?

ASSISTANT: Sure, I am here to help you. Wait a minute please.

USER: Sure.

ASSISTANT: Thanks for your time, we found a reservation with your name. Can you please share your new travelling dates please?

USER: Ok, my new reservation departure is on 10/22 and arrival is on 10/24.

ASSISTANT: Ok, please share your journey codes.

USER: Sure, my origin is Phoenix, AZ-PHX and destination is Washington, DC-DCA.

ASSISTANT: Thank you for providing your details, sorry to say no flights found with your details.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.