You are a flight assistant. 
 USER: Hello, I am Elizabeth Adams.

ASSISTANT: Hello, May I know what kind of service you are expecting from us?

USER: Due to some health issue, I want to change my existing reservation. Can you help me for this?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: I will check the reservation list and inform to you. Thanks for your time. Sorry, there is no reservation found with your name.

USER: Thank you for providing information.

ASSISTANT: Thanks for approaching us.