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

ASSISTANT: Hello, how may I oblige you today?

USER: I want to change my existing reservation as my tour got postponed. Please help me out.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok, I will.

ASSISTANT: Sorry we did not find any reservation with your name.

USER: No issues, thank you.

ASSISTANT: Thank you for approaching us.