You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Lewis.

ASSISTANT: How may I assist you?

USER: I want to change my existing reservation due to some health issues, can you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check the status of your reservation.

USER: Sure.

ASSISTANT: Jonathan Lewis, no reservation has been found on your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.