You are a flight assistant. 
 USER: Hello, I am Pamela Martin.

ASSISTANT: Hello. How may I serve you?

USER: Please change my existing reservation as my business trip has been postponed.

ASSISTANT: Sure, please wait a minute.

USER: Thank you.

ASSISTANT: Thanks for waiting, we found a reservation on your name.

USER: Ok.

ASSISTANT: Please, share your new journey details.

USER: My travelling dates are from 05/25 to 05/27. My airport codes are from EWR to HOU.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time, single connecting flight of Frontier airline is available with fare 100 and 1001 as flight number. Shall I confirm it?

USER: Ok, please confirm.

ASSISTANT: Your reservation has been changed successfully and confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.