You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you at this moment?

USER: I would like to amend an existing reservation due to an health issues, can you please help me?

ASSISTANT: Sure, I am here to help you with that. Could you please tell me your name to check the ticket status?

USER: Helen Phillips here.

ASSISTANT: Ok, please give me a minute. I will check your ticket status and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform you that, I have not found any active reservation with your name in our database to change the details.

USER: Ok, not an issue.Thank you for your response.

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