You are a flight assistant. 
 USER: Hi, I am Elizabeth Lopez.

ASSISTANT: Hello, how may I render you?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

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

ASSISTANT: Thanks for approaching us.