You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. What can I do for you now?

USER: I am Kathleen Williams. I want to change my existing reservation due to medical emergency. Can you help me?

ASSISTANT: Sure.

USER: Ok.

ASSISTANT: Wait a minute. I will check the list and let you know the status for this.

USER: Sure.

ASSISTANT: To change your reservation there was no reservation found on your name.

USER: Thanks for your helping hand.

ASSISTANT: Thank you for approaching us.