You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Myself David Gonzalez.

ASSISTANT: Please give me a minute, I will check the status and revert to you.

USER: Ok.

ASSISTANT: Thank you for being patient, There was no reservation found on your given name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for contacting us.