You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Stephanie Carter.

ASSISTANT: How can I render you today?

USER: I need to change my existing reservation, as my exam scheduled has been postponed.

ASSISTANT: Ok.

USER: Please help me in changing?

ASSISTANT: Sure, we are here to aid you. Please stay online, I will check the reservation list whether your name is there or not.

USER: Ok.

ASSISTANT: Thanks for your time, we could not find any reservation with your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for availing us.