You are a flight assistant. 
 USER: Hi,. I am Sarah Phillips.

ASSISTANT: Hello, how may I support you today?

USER: Please, change my earlier reservation as my meeting got postponed.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: Thank you for being patience, there is a reservation found on your name.

USER: Ok.

ASSISTANT: Please share your journey details.

USER: My trip dates are 08/02 -08/04.

ASSISTANT: Ok.

USER: I will start from SFO to reach PHL.

ASSISTANT: Thank you for sharing details.

USER: Ok.

ASSISTANT: There is a flight available with fare 800. Shall I proceed?

USER: I need a plane with the fare of 500.

ASSISTANT: Ok.

USER: Do not proceed. Thank you for help.

ASSISTANT: Thank you.