You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, I will help you. Can I have your name?

USER: My name is Emma Mitchell.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, I did not find any reservation on your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.