You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my existing reservation due to my health issue, so can you please help me with changing my reservation?

ASSISTANT: Sure, I can help you. May I know your name?

USER: My name is Edward Anderson.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. We didnt found any reservation by this name.

USER: No problem, thank you.

ASSISTANT: Thank you for contating us.