You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, my exam got  preponed. So I had a request to you to change my existing reservation?

ASSISTANT: Sure, may I know your name to check the reservation list for changing process?

USER: Sure, my name is Elizabeth Taylor.

ASSISTANT: Thank you for the name, please be on hold.

USER: Sure.

ASSISTANT: Thank you for being waiting. I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: Thanks for your quality customer service.