You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,how can I help you today?

USER: Owing to an emergency I need to change an existing reservation. Can you help me with this?

ASSISTANT: Sure, kindly mention your name for checking the reservation.

USER: I am Sharon Nelson.

ASSISTANT: Please wait a moment.

USER: Ok.

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

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

ASSISTANT: Thanks for reaching us.