You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Richard Martinez here. Due to some health issues, my doctor has prescribed me not to do journeys for a month. So, I need your help in changing my reservation details. Will you please help me in that?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Sure, I'll wait for your response.

ASSISTANT: Sorry Martinez, there is no reservation found as per your name to change your reservation in your database.

USER: Oh! May be something went wrong while I was doing my reservation. I'll recheck it once and get back to you later. Thank you so much for your service anyways.

ASSISTANT: You are welcome and have a great day.