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

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in changing my recent reservation? As my exam has been postponed.

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: There is no reservation found in your name to change it.

USER: Oh! May be I have done wrong reservation, Anyways thank you.

ASSISTANT: Thank you for availing us.