You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Martin.

ASSISTANT: How may I help you?

USER: Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your given name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.