You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Jason Martinez here. I want to change my existing reservation due to some health issues, can you please help me in this?

ASSISTANT: Ok, please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Oh! Sorry for the inconvenience there is no reservation found on your name.

USER: Ok, no problem .

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.