You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you today?

USER: I want to change my existing reservation in the name of Emma Carter. Can you help me in this?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation exists in your name.

USER: It's not a problem, thank you.

ASSISTANT: Thanks for reaching us.