You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I give assistance to you?

USER: I want to change my existing reservation due to bad health conditions. Can you help me with that?

ASSISTANT: Sure, we are glad to help you to change it. To proceed further, may I know your name?

USER: Thank you. Sure, I am Ashley Lewis.

ASSISTANT: Thanks for your name, please wait for a while then I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your specified name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing our service.