You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation due to an emergency, can you please help me?

ASSISTANT: Sure, can you share your name?

USER: Sure, my name is Robert Wilson.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us.