You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I want to change an existing reservation due to an emergency, can you please help me?

ASSISTANT: May I know your name to check your reservation?

USER: Sure, my name is Betty Phillips here.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Welcome Betty Phillips.