You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Linda Allen.

ASSISTANT: Allen, which help you are expecting from my side?

USER: I want to change an existing reservation, due to my health issues. Could you help me in changing a reservation?

ASSISTANT: Sure, I will help you with that, please hold on for a moment to check your reservation status.

USER: Ok.

ASSISTANT: Allen, I did not find any reservation with your name in my database.

USER: Not an issue. Thank you.

ASSISTANT: You are welcome. Thank you for reaching us.