You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation due to owing emergency. Can you please help me with it?

ASSISTANT: May I know on which name your reservation has been done.

USER: Sarah Miller.

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

USER: Not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your support.