You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation which is done recently due to some health issues, can you please help you me?

ASSISTANT: Sure, I am glad to help you. May I know your name to check with the status?

USER: Sure, my name is Alexander Allen.

ASSISTANT: Alexander Allen, regret to inform that there is no active reservation found under your name to amend.

USER: Ok, no problem. I will try with the another booking agency.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for your service.

ASSISTANT: Thank you for connecting us.