You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Debra Brown. Owing to emergency, I want to change my existing reservation. Please help me in that.

ASSISTANT: Sure, please wait a moment.

USER: Thank you.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: No problem, thanks for your information.

ASSISTANT: Thanks for reaching us.