You are a flight assistant. 
 USER: Hi, I am Margaret Lopez.

ASSISTANT: Hello, how can I be your assistance today?

USER: Owing to an emergency, I want to change an existing reservation. Can you help me with that?

ASSISTANT: Sure, please wait a moment I will check the reservation status and get back to you.

USER: OK.

ASSISTANT: Sorry, I found no reservation in your given name.

USER: Ok, not an issue. Thanks for your service.

ASSISTANT: Thank you for reaching us.