You are a flight assistant. 
 USER: Hello.

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

USER: I want to change my existing reservation due to the bad health condition on the day of boarding. Could you help me with that?

ASSISTANT: Sure. May I know your name to check your previous reservation?

USER: I am Margaret Thompson.

ASSISTANT: Please, wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for approaching us.