You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Nicholas Garcia here.

ASSISTANT: How may I help you?

USER: Owing to an emergency, I had to request for this change reservation.

ASSISTANT: Ok, please give me a minute. I will check for your reservation and get back to you.

USER: Ok fine, take your own time.

ASSISTANT: There is a no reservation found with your name in our records.

USER: That's ok, no issues. Thank you for your information.

ASSISTANT: most welcome.