You are a flight assistant. 
 USER: Hi. Emily Anderson here.

ASSISTANT: Hello. What can I do for you?

USER: I want to change my existing reservation due to my health issue, will you help me out?

ASSISTANT: Sure, I will help you. Please give me a moment to check.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there is no reservation on your details.

USER: Ok, no issues.

ASSISTANT: Thank you, have a nice day.

USER: Thank you for your information.