You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nicole Collins here.

ASSISTANT: How can I help you at this moment?

USER: I want to change my recent reservation because my health condition was not good, can you help me?

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check your reservation status.

USER: Sure, take your own time.

ASSISTANT: There is no previous reservation available under your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.