You are a flight assistant. 
 USER: Hi. I am Alexander Gonzalez.

ASSISTANT: Hello, how may I be of your service?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me?

ASSISTANT: Sure, give me sometime. I will check and get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting. Unfortunately there is no reservation found matching your name.

USER: No issue, I will choose other alternative.

ASSISTANT: Thank you for reaching us.

USER: Thank you.