You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I need to change my recent reservation due to some health issues, can you help me in doing that?

ASSISTANT: Sure, May I know your name?

USER: I am Jack Hall.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

USER: Ok, no issues. Thank you for opting us.

ASSISTANT: Thank you.