You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Justin Rodriguez. I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, let me check your reservation details in our database.

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Take your time.

ASSISTANT: Sorry, no reservation found by your name in our database.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.