You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Debra Wright.

ASSISTANT: Yes, Debra.

USER: Due to my health problem I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, please be online.

USER: Sure.

ASSISTANT: I have searched our database for your reservation but I didn't find it.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for choosing us.