You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation, due to health issues. Can you please help me?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: My name is Deborah Clark.

ASSISTANT: Please allow me a moment while I check for the reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Deborah Clark, there is no reservation found under your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for contacting us.