You are a flight assistant. 
 USER: Hi, I am George Thomas.

ASSISTANT: Hello, how may I assist you today?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Please hold on, I will check in the previous list and revert to you.

USER: Ok.

ASSISTANT: Thanks for being patient, we have tried hard to find your reservation but could not find your reservation to change.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thanks for reaching us, hope to serve you again.