You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Johnson.

ASSISTANT: How can I aid you today?

USER: I want to change my existing reservation due to my meeting got postponed. Can you help me in that?

ASSISTANT: Ok. Please standby.

USER: Sure.

ASSISTANT: I will check and get back to you. Thanks for being patience. We found that there was no reservation found with your name.

USER: OK, No problem. Thank you for your information.

ASSISTANT: Thanks for connecting us.